diff --git a/.gitignore b/.gitignore
index ea8c4bf..6b3e392 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /target
+*.profraw
diff --git a/coverage.md b/coverage.md
index 6c31b8b..a1c9a47 100644
--- a/coverage.md
+++ b/coverage.md
@@ -1,3 +1,8 @@
+```
+cargo install grcov
+rustup component add llvm-tools-preview
+```
+
 ```
 RUSTFLAGS="-Cinstrument-coverage" cargo clean
 RUSTFLAGS="-Cinstrument-coverage" cargo test
diff --git a/src/level_generator.rs b/src/level_generator.rs
index e5b9cad..6b28d12 100644
--- a/src/level_generator.rs
+++ b/src/level_generator.rs
@@ -35,7 +35,7 @@ enum Direction {
 }
 
 impl LevelGenerator {
-    pub fn generate_rooms_to_place(
+    fn generate_rooms_to_place(
         rng: &mut ThreadRng,
         level: usize,
         first: bool,
@@ -67,7 +67,7 @@ impl LevelGenerator {
         rooms_to_place
     }
 
-    pub fn place_rooms(
+    fn place_rooms(
         rng: &mut ThreadRng,
         rooms_to_place: &mut Vec<Room>,
     ) -> [[Room; ROOMS_VERTICAL]; ROOMS_HORIZONTAL] {
@@ -134,7 +134,7 @@ impl LevelGenerator {
         rooms
     }
 
-    pub fn create_mst(
+    fn create_mst(
         rooms: &[[Room; ROOMS_VERTICAL]; ROOMS_HORIZONTAL],
     ) -> Graph<(usize, usize), u16, petgraph::Undirected> {
         let mut graph = UnGraph::<(usize, usize), u16>::default();
@@ -178,6 +178,45 @@ impl LevelGenerator {
         // graph
     }
 
+    fn create_connections(
+        rooms: &mut [[Room; ROOMS_VERTICAL]; ROOMS_HORIZONTAL],
+        mst: &Graph<(usize, usize), u16, petgraph::Undirected>,
+    ) {
+        for edge in mst.raw_edges() {
+            // the tuples are (col, row)
+            let (src_node_col, src_node_row) = mst[edge.source()];
+            let (tgt_node_col, tgt_node_row) = mst[edge.target()];
+            let src_room = rooms[src_node_col][src_node_row];
+            let tgt_room = rooms[tgt_node_col][tgt_node_row];
+
+            if src_node_col == tgt_node_col {
+                 let start_col =
+                    src_node_col * ROOM_WIDTH + src_room.offset_x + (src_room.width + 1) / 2;
+                let start_row =
+                    src_node_row * ROOM_HEIGHT + src_room.offset_y + src_room.height + 1;
+                let end_col =
+                    tgt_node_col * ROOM_WIDTH + tgt_room.offset_x + (tgt_room.width + 1) / 2;
+                let end_row = tgt_node_row * ROOM_HEIGHT - 1 + tgt_room.offset_y;
+                rooms[src_node_col][src_node_row].connection_down = Some(Connection {
+                    start_pos: (start_col, start_row),
+                    end_pos: (end_col, end_row),
+                });
+            } else {
+                // println!("Right");
+                let start_col = src_node_col * ROOM_WIDTH + src_room.offset_x + src_room.width;
+                let start_row =
+                    src_node_row * ROOM_HEIGHT + src_room.offset_y + (src_room.height + 1) / 2;
+                let end_col = tgt_node_col * ROOM_WIDTH -1 + tgt_room.offset_x;
+                let end_row =
+                    tgt_node_row * ROOM_HEIGHT + tgt_room.offset_y + (tgt_room.height + 1) / 2;
+                rooms[src_node_col][src_node_row].connection_right = Some(Connection {
+                    start_pos: (start_col, start_row),
+                    end_pos: (end_col, end_row),
+                });
+            }
+        }
+    }
+
     pub fn generate(level: usize, first: bool, last: bool) -> Self {
         let mut rng = rand::thread_rng();
 
@@ -211,38 +250,11 @@ impl LevelGenerator {
         /*
            Construct a graph from the unconnected rooms and make a minum spanning tree of it
         */
-        
-        let mst: Graph<(usize, usize), u16, petgraph::Undirected> =LevelGenerator::create_mst(&rooms);
-        
-        for edge in mst.raw_edges() {
-            // the tuples are (col, row)
-            let (src_node_col, src_node_row) = mst[edge.source()];
-            let (tgt_node_col, tgt_node_row) = mst[edge.target()];
-            // println!("MST Edge from {:?} to {:?}", (src_node_col, src_node_row), (tgt_node_col, tgt_node_row));
 
-            if src_node_col == tgt_node_col {
-                // println!("Down");
-                let start_col = src_node_col * ROOM_WIDTH + ROOM_WIDTH / 2;
-                let start_row = src_node_row * ROOM_HEIGHT + ROOM_HEIGHT;
-                let end_col = tgt_node_col * ROOM_WIDTH + ROOM_WIDTH / 2;
-                let end_row = tgt_node_row * ROOM_HEIGHT;
-                rooms[src_node_col][src_node_row].connection_down = Some(Connection {
-                    start_pos: (start_col, start_row),
-                    end_pos: (end_col, end_row),
-                });
-            } else {
-                // println!("Right");
-                let start_col = src_node_col * ROOM_WIDTH + ROOM_WIDTH;
-                let start_row = src_node_row * ROOM_HEIGHT + ROOM_HEIGHT / 2;
-                let end_col = tgt_node_col * ROOM_WIDTH;
-                let end_row = tgt_node_row * ROOM_HEIGHT + ROOM_HEIGHT / 2;
-                rooms[src_node_col][src_node_row].connection_right = Some(Connection {
-                    start_pos: (start_col, start_row),
-                    end_pos: (end_col, end_row),
-                });
-            }
-        }
+        let mst: Graph<(usize, usize), u16, petgraph::Undirected> =
+            LevelGenerator::create_mst(&rooms);
 
+        LevelGenerator::create_connections(&mut rooms, &mst);
         LevelGenerator { level, rooms, rng }
     }
 
@@ -488,7 +500,7 @@ fn test_place_rooms() {
 fn test_create_mst() {
     let mut rng = rand::thread_rng();
     let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
-    let res = LevelGenerator::create_mst(&rooms);
+    let res: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
     assert_eq!(res.node_count(), 0);
     assert_eq!(res.edge_count(), 0);
 
@@ -518,6 +530,285 @@ fn test_create_mst() {
     assert_eq!(res.edge_count(), 4);
 }
 
+#[test]
+fn test_create_connections_down_1() {
+    // test full sized rooms for downwards connection
+    let mut rng = rand::thread_rng();
+    let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
+    rooms[1][1].width = ROOM_WIDTH - 1;
+    rooms[1][1].offset_x = 0;
+    rooms[1][1].height = ROOM_HEIGHT - 1;
+    rooms[1][1].offset_y = 0;
+    rooms[1][1].kind = RoomType::BasicRoom;
+
+    rooms[1][3].width = ROOM_WIDTH - 1;
+    rooms[1][3].offset_x = 0;
+    rooms[1][3].height = ROOM_HEIGHT - 1;
+    rooms[1][3].offset_y = 0;
+    rooms[1][3].kind = RoomType::BasicRoom;
+    let mst: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
+    LevelGenerator::create_connections(&mut rooms, &mst);
+
+    assert!(rooms[1][1].connection_down.is_some());
+    assert_eq!(
+        rooms[1][1].connection_down.unwrap().start_pos,
+        (ROOM_WIDTH + ROOM_WIDTH / 2, ROOM_HEIGHT * 2),
+        "wrong start"
+    );
+    assert_eq!(
+        rooms[1][1].connection_down.unwrap().end_pos,
+        (ROOM_WIDTH + ROOM_WIDTH / 2, ROOM_HEIGHT * 3 - 1),
+        "wrong end"
+    );
+    assert!(rooms[1][1].connection_right.is_none());
+    assert!(rooms[1][2].connection_down.is_none());
+    assert!(rooms[1][2].connection_right.is_none());
+}
+
+#[test]
+fn test_create_connections_down_2() {
+    // test reduced width rooms (with overlap) for downwards connection
+    let mut rng = rand::thread_rng();
+    let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
+    rooms[1][1].width = 5;
+    rooms[1][1].offset_x = 0;
+    rooms[1][1].height = ROOM_HEIGHT - 1;
+    rooms[1][1].offset_y = 0;
+    rooms[1][1].kind = RoomType::BasicRoom;
+
+    rooms[1][3].width = 5;
+    rooms[1][3].offset_x = 4;
+    rooms[1][3].height = ROOM_HEIGHT - 1;
+    rooms[1][3].offset_y = 0;
+    rooms[1][3].kind = RoomType::BasicRoom;
+    let mst: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
+    LevelGenerator::create_connections(&mut rooms, &mst);
+
+    assert!(rooms[1][1].connection_down.is_some());
+    assert_eq!(
+        rooms[1][1].connection_down.unwrap().start_pos,
+        (ROOM_WIDTH + 3, ROOM_HEIGHT * 2),
+        "wrong start"
+    );
+    assert_eq!(
+        rooms[1][1].connection_down.unwrap().end_pos,
+        (ROOM_WIDTH + 7, ROOM_HEIGHT * 3 - 1),
+        "wrong end"
+    );
+    assert!(rooms[1][1].connection_right.is_none());
+    assert!(rooms[1][2].connection_down.is_none());
+    assert!(rooms[1][2].connection_right.is_none());
+}
+
+#[test]
+fn test_create_connections_down_3() {
+    // test reduced width rooms (with NO overlap) for downwards connection
+    let mut rng = rand::thread_rng();
+    let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
+    rooms[1][1].width = 3;
+    rooms[1][1].offset_x = 0;
+    rooms[1][1].height = ROOM_HEIGHT - 1;
+    rooms[1][1].offset_y = 0;
+    rooms[1][1].kind = RoomType::BasicRoom;
+
+    rooms[1][3].width = 3;
+    rooms[1][3].offset_x = 5;
+    rooms[1][3].height = ROOM_HEIGHT - 1;
+    rooms[1][3].offset_y = 0;
+    rooms[1][3].kind = RoomType::BasicRoom;
+    let mst: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
+    LevelGenerator::create_connections(&mut rooms, &mst);
+
+    assert!(rooms[1][1].connection_down.is_some());
+    assert_eq!(
+        rooms[1][1].connection_down.unwrap().start_pos,
+        (ROOM_WIDTH + 2, ROOM_HEIGHT * 2),
+        "wrong start"
+    );
+    assert_eq!(
+        rooms[1][1].connection_down.unwrap().end_pos,
+        (ROOM_WIDTH + 7, ROOM_HEIGHT * 3 - 1),
+        "wrong end"
+    );
+    assert!(rooms[1][1].connection_right.is_none());
+    assert!(rooms[1][2].connection_down.is_none());
+    assert!(rooms[1][2].connection_right.is_none());
+}
+
+#[test]
+fn test_create_connections_down_4() {
+    // test reduced and moved width rooms (with NO overlap) for downwards connection
+    let mut rng = rand::thread_rng();
+    let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
+    rooms[1][1].width = 3;
+    rooms[1][1].offset_x = 0;
+    rooms[1][1].height = 4;
+    rooms[1][1].offset_y = 0;
+    rooms[1][1].kind = RoomType::BasicRoom;
+
+    rooms[1][3].width = 3;
+    rooms[1][3].offset_x = 5;
+    rooms[1][3].height = 4;
+    rooms[1][3].offset_y = 1;
+    rooms[1][3].kind = RoomType::BasicRoom;
+    let mst: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
+    LevelGenerator::create_connections(&mut rooms, &mst);
+
+    assert!(rooms[1][1].connection_down.is_some());
+    assert_eq!(
+        rooms[1][1].connection_down.unwrap().start_pos,
+        (ROOM_WIDTH + 2, ROOM_HEIGHT + 5),
+        "wrong start"
+    );
+    assert_eq!(
+        rooms[1][1].connection_down.unwrap().end_pos,
+        (ROOM_WIDTH + 7, ROOM_HEIGHT * 3 + 0),
+        "wrong end"
+    );
+    assert!(rooms[1][1].connection_right.is_none());
+    assert!(rooms[1][2].connection_down.is_none());
+    assert!(rooms[1][2].connection_right.is_none());
+}
+
+#[test]
+fn test_create_connections_right_1() {
+    let mut rng = rand::thread_rng();
+    let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
+    rooms[1][1].width = ROOM_WIDTH - 1;
+    rooms[1][1].offset_x = 0;
+    rooms[1][1].height = ROOM_HEIGHT - 1;
+    rooms[1][1].offset_y = 0;
+    rooms[1][1].kind = RoomType::BasicRoom;
+
+    rooms[3][1].width = ROOM_WIDTH - 1;
+    rooms[3][1].offset_x = 0;
+    rooms[3][1].height = ROOM_HEIGHT - 1;
+    rooms[3][1].offset_y = 0;
+    rooms[3][1].kind = RoomType::BasicRoom;
+    let mst: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
+    LevelGenerator::create_connections(&mut rooms, &mst);
+
+    assert!(rooms[1][1].connection_down.is_none());
+    assert!(rooms[1][1].connection_right.is_some());
+    assert_eq!(
+        rooms[1][1].connection_right.unwrap().start_pos,
+        (ROOM_WIDTH * 2-1, ROOM_HEIGHT + ROOM_HEIGHT / 2),
+        "wrong start"
+    );
+    assert_eq!(
+        rooms[1][1].connection_right.unwrap().end_pos,
+        (ROOM_WIDTH * 3 - 1, ROOM_HEIGHT + ROOM_HEIGHT / 2),
+        "wrong end"
+    );
+    assert!(rooms[1][2].connection_down.is_none());
+    assert!(rooms[1][2].connection_right.is_none());
+}
+
+#[test]
+fn test_create_connections_right_2() {
+    // test reduced width rooms (with overlap) for downwards connection
+    let mut rng = rand::thread_rng();
+    let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
+    rooms[1][1].width = ROOM_WIDTH - 1;
+    rooms[1][1].offset_x = 0;
+    rooms[1][1].height = 4;
+    rooms[1][1].offset_y = 0;
+    rooms[1][1].kind = RoomType::BasicRoom;
+
+    rooms[3][1].width = ROOM_WIDTH - 1;
+    rooms[3][1].offset_x = 0;
+    rooms[3][1].height = 4;
+    rooms[3][1].offset_y = 2;
+    rooms[3][1].kind = RoomType::BasicRoom;
+    let mst: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
+    LevelGenerator::create_connections(&mut rooms, &mst);
+
+    assert!(rooms[1][1].connection_down.is_none());
+    assert!(rooms[1][1].connection_right.is_some());
+    assert_eq!(
+        rooms[1][1].connection_right.unwrap().start_pos,
+        (ROOM_WIDTH * 2-1, ROOM_HEIGHT + 2),
+        "wrong start"
+    );
+    assert_eq!(
+        rooms[1][1].connection_right.unwrap().end_pos,
+        (ROOM_WIDTH * 3 - 1, ROOM_HEIGHT + 4),
+        "wrong end"
+    );
+    assert!(rooms[1][2].connection_down.is_none());
+    assert!(rooms[1][2].connection_right.is_none());
+}
+
+#[test]
+fn test_create_connections_right_3() {
+    // test reduced width rooms (with NO overlap) for downwards connection
+    let mut rng = rand::thread_rng();
+    let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
+    rooms[1][1].width = ROOM_WIDTH - 1;
+    rooms[1][1].offset_x = 0;
+    rooms[1][1].height = 2;
+    rooms[1][1].offset_y = 0;
+    rooms[1][1].kind = RoomType::BasicRoom;
+
+    rooms[3][1].width = ROOM_WIDTH - 1;
+    rooms[3][1].offset_x = 0;
+    rooms[3][1].height = 2;
+    rooms[3][1].offset_y = 4;
+    rooms[3][1].kind = RoomType::BasicRoom;
+    let mst: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
+    LevelGenerator::create_connections(&mut rooms, &mst);
+
+    assert!(rooms[1][1].connection_down.is_none());
+    assert!(rooms[1][1].connection_right.is_some());
+    assert_eq!(
+        rooms[1][1].connection_right.unwrap().start_pos,
+        (ROOM_WIDTH * 2 - 1, ROOM_HEIGHT + 1),
+        "wrong start"
+    );
+    assert_eq!(
+        rooms[1][1].connection_right.unwrap().end_pos,
+        (ROOM_WIDTH * 3 - 1, ROOM_HEIGHT + 5),
+        "wrong end"
+    );
+    assert!(rooms[1][2].connection_down.is_none());
+    assert!(rooms[1][2].connection_right.is_none());
+}
+
+#[test]
+fn test_create_connections_right_4() {
+    // test reduced width rooms (with NO overlap) for downwards connection
+    let mut rng = rand::thread_rng();
+    let mut rooms = [[Room::new(&mut rng); ROOMS_VERTICAL]; ROOMS_HORIZONTAL];
+    rooms[1][1].width = 4;
+    rooms[1][1].offset_x = 3;
+    rooms[1][1].height = 2;
+    rooms[1][1].offset_y = 0;
+    rooms[1][1].kind = RoomType::BasicRoom;
+
+    rooms[3][1].width = 3;
+    rooms[3][1].offset_x = 3;
+    rooms[3][1].height = 2;
+    rooms[3][1].offset_y = 4;
+    rooms[3][1].kind = RoomType::BasicRoom;
+    let mst: Graph<(usize, usize), u16, petgraph::Undirected> = LevelGenerator::create_mst(&rooms);
+    LevelGenerator::create_connections(&mut rooms, &mst);
+
+    assert!(rooms[1][1].connection_down.is_none());
+    assert!(rooms[1][1].connection_right.is_some());
+    assert_eq!(
+        rooms[1][1].connection_right.unwrap().start_pos,
+        (ROOM_WIDTH +7, ROOM_HEIGHT + 1),
+        "wrong start"
+    );
+    assert_eq!(
+        rooms[1][1].connection_right.unwrap().end_pos,
+        (ROOM_WIDTH * 3 + 2, ROOM_HEIGHT + 5),
+        "wrong end"
+    );
+    assert!(rooms[1][2].connection_down.is_none());
+    assert!(rooms[1][2].connection_right.is_none());
+}
+
 /*
        println!("  0 1 2 3 4 5 6 7");
        for r in 0..ROOMS_VERTICAL {