diff --git a/src/map_builders.rs b/src/map_builders.rs
index 0d210c3..1aaf747 100644
--- a/src/map_builders.rs
+++ b/src/map_builders.rs
@@ -12,6 +12,8 @@ mod prefab_builder;
 mod room_based_spawner;
 mod room_based_stairs;
 mod room_based_starting_position;
+mod room_corner_rounding;
+mod room_exploder;
 mod simple_map;
 mod voronoi;
 mod voronoi_spawning;
@@ -31,6 +33,8 @@ use prefab_builder::PrefabBuilder;
 use room_based_spawner::RoomBasedSpawner;
 use room_based_stairs::RoomBasedStairs;
 use room_based_starting_position::RoomBasedStartingPosition;
+use room_corner_rounding::RoomCornerRounder;
+use room_exploder::RoomExploder;
 use simple_map::SimpleMapBuilder;
 use specs::prelude::*;
 use voronoi::VoronoiCellBuilder;
diff --git a/src/map_builders/room_corner_rounding.rs b/src/map_builders/room_corner_rounding.rs
new file mode 100644
index 0000000..e48f248
--- /dev/null
+++ b/src/map_builders/room_corner_rounding.rs
@@ -0,0 +1,60 @@
+use crate::map_builders::{BuilderMap, MetaMapBuilder};
+use crate::{Rect, TileType};
+use rltk::RandomNumberGenerator;
+
+pub struct RoomCornerRounder {}
+
+impl MetaMapBuilder for RoomCornerRounder {
+    fn build_map(&mut self, rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap) {
+        self.build(rng, build_data);
+    }
+}
+
+impl RoomCornerRounder {
+    #[allow(dead_code)]
+    pub fn new() -> Box<RoomCornerRounder> {
+        Box::new(RoomCornerRounder {})
+    }
+
+    fn fill_if_corner(&mut self, x: i32, y: i32, build_data: &mut BuilderMap) {
+        let w = build_data.map.width;
+        let h = build_data.map.height;
+        let idx = build_data.map.xy_idx(x, y);
+        let mut neighbor_walls = 0;
+
+        if x > 0 && build_data.map.tiles[idx - 1] == TileType::Wall {
+            neighbor_walls += 1;
+        }
+        if y > 0 && build_data.map.tiles[idx - w as usize] == TileType::Wall {
+            neighbor_walls += 1;
+        }
+        if x < w - 2 && build_data.map.tiles[idx + 1] == TileType::Wall {
+            neighbor_walls += 1;
+        }
+        if y < h - 2 && build_data.map.tiles[idx + w as usize] == TileType::Wall {
+            neighbor_walls += 1;
+        }
+
+        if neighbor_walls == 2 {
+            build_data.map.tiles[idx] = TileType::Wall;
+        }
+    }
+
+    fn build(&mut self, _rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap) {
+        let rooms: Vec<Rect>;
+        if let Some(rooms_builder) = &build_data.rooms {
+            rooms = rooms_builder.clone();
+        } else {
+            panic!("Room Rounding requires a builder with room structures");
+        }
+
+        for room in rooms.iter() {
+            self.fill_if_corner(room.x1 + 1, room.y1 + 1, build_data);
+            self.fill_if_corner(room.x2, room.y1 + 1, build_data);
+            self.fill_if_corner(room.x1 + 1, room.y2, build_data);
+            self.fill_if_corner(room.x2, room.y2, build_data);
+
+            build_data.take_snapshot();
+        }
+    }
+}
diff --git a/src/map_builders/room_exploder.rs b/src/map_builders/room_exploder.rs
new file mode 100644
index 0000000..3db8a7f
--- /dev/null
+++ b/src/map_builders/room_exploder.rs
@@ -0,0 +1,88 @@
+use crate::map_builders::common::{paint, Symmetry};
+use crate::map_builders::{BuilderMap, MetaMapBuilder};
+use crate::{Rect, TileType};
+use rltk::RandomNumberGenerator;
+
+pub struct RoomExploder {}
+
+impl MetaMapBuilder for RoomExploder {
+    fn build_map(&mut self, rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap) {
+        self.build(rng, build_data);
+    }
+}
+
+impl RoomExploder {
+    #[allow(dead_code)]
+    pub fn new() -> Box<RoomExploder> {
+        Box::new(RoomExploder {})
+    }
+
+    fn build(&mut self, rng: &mut RandomNumberGenerator, build_data: &mut BuilderMap) {
+        let rooms: Vec<Rect>;
+        if let Some(rooms_builder) = &build_data.rooms {
+            rooms = rooms_builder.clone();
+        } else {
+            panic!("Room Explosions require a builder with room structures");
+        }
+
+        for room in rooms.iter() {
+            let start = room.center();
+            let n_diggers = rng.roll_dice(1, 20) - 5;
+
+            if n_diggers > 0 {
+                for _i in 0..n_diggers {
+                    let mut drunk_x = start.0;
+                    let mut drunk_y = start.1;
+
+                    let mut drunk_life = 20;
+                    let mut did_something = false;
+
+                    while drunk_life > 0 {
+                        let drunk_idx = build_data.map.xy_idx(drunk_x, drunk_y);
+                        if build_data.map.tiles[drunk_idx] == TileType::Wall {
+                            did_something = true;
+                        }
+
+                        paint(&mut build_data.map, Symmetry::None, 1, drunk_x, drunk_y);
+                        build_data.map.tiles[drunk_idx] = TileType::DownStairs;
+
+                        match rng.roll_dice(1, 4) {
+                            1 => {
+                                if drunk_x > 2 {
+                                    drunk_x -= 1;
+                                }
+                            }
+                            2 => {
+                                if drunk_x < build_data.map.width - 2 {
+                                    drunk_x += 1;
+                                }
+                            }
+                            3 => {
+                                if drunk_y > 2 {
+                                    drunk_y -= 1;
+                                }
+                            }
+                            _ => {
+                                if drunk_y < build_data.map.height - 2 {
+                                    drunk_y += 1;
+                                }
+                            }
+                        }
+
+                        drunk_life -= 1;
+                    }
+
+                    if did_something {
+                        build_data.take_snapshot();
+                    }
+
+                    for t in build_data.map.tiles.iter_mut() {
+                        if *t == TileType::DownStairs {
+                            *t = TileType::Floor;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}