Cracked Dungeon Bricks are blocks which can be found in the Dungeon and appear very similar to ordinary Dungeon Bricks. If jumped on, walked across, grappled to, mined with any pickaxe or drill, or hit by projectiles, several Cracked Dungeon Bricks nearby the targeted block, including the block itself, may fall and be destroyed upon hitting solid ground, dropping no item. Cracked Dungeon Bricks can conceal important pathways to significant portions of the Dungeon, potentially making it seem much smaller than it actually is. Additionally, naturally-generated Cracked Dungeon Bricks often conceal rectangular pits lined with Spikes, which may sometimes be filled with water to make escape more difficult.
Cracked Dungeon Bricks can be crafted with regular Dungeon Bricks at a Heavy Work Bench. Crafted Cracked Dungeon Bricks behave the same as naturally generated Cracked Dungeon Bricks, and do not drop an item upon destruction.
Cracked Green Bricks blocking a pathway in the Dungeon.
A Cracked Dungeon Brick will break either if the player hits it with a pickaxe or drill, directly grapples to the block, collides with it with enough speed, damages it with a Grenade, or hits it with a projectile. Cracked Dungeon Bricks also have a 1/2 (50%) chance to break if other falling Cracked Dungeon Bricks hit them.[1]
Player collision
Each tick[2], the game will perform the following steps to break any nearby Cracked Dungeon Bricks:[3]
The game will check if the player is moving faster than a random threshold velocity that is between 10 mph and 61 mph. Both horizontal and falling speed are checked.
If this is the case, the game will check if any of the blocks beneath the player are Cracked Dungeon Bricks and allow a bottom slope (i.e., no hanging banners/furniture), and then will check where the player would have ended up if there were no blocks there.
From this position, the game will check if there are any Cracked Dungeon Bricks under this hypothetical player's feet which also have no tiles above them.
If so, the game will break all the Cracked Dungeon Bricks with no tiles above them, from 24 pixels behind to 24 pixels in front of the player's hitbox, and up to 2 tiles below the bottom of the player's hitbox.
Grenades
All types of Grenades will destroy all Cracked Dungeon Bricks within a radius of about four tiles upon exploding.[4] This makes them, especially Sticky Grenades, ideal for removing large groups of Cracked Dungeon Bricks.
Destruction
When a Cracked Dungeon Brick tile is destroyed, the eight Cracked Dungeon Bricks around it have a 1/6 (16.67%) chance to break, except the tile directly above it, which has a 1/3 (33.33%) chance to be destroyed.[5]
Cracked Blue Dungeon Bricks concealing a pit of Spikes with the Dangersensebuff active.
Notes
Cracked Dungeon Bricks are highlighted while under the effects of a Dangersense Potion, unless they are hammered into a slope.
Cracked Dungeon Bricks break off in significantly smaller amounts in multiplayer compared to singleplayer, causing players to take much more time to mine through blocked passages, but also slightly reducing the danger of Spike pits.
Tips
Cracked Dungeon Bricks on the floor may conceal rectangular rooms filled with Spikes or water, so care should be taken when exploring the Dungeon. The aforementioned Dangersense Potion is a valuable aid.
Using a mount to enlarge the player's hitbox may make stomping out Cracked Dungeon Bricks easier.
Trivia
Cracked Dungeon Bricks share some properties of Thin Ice and Sand, although they have distinct differences from both.
↑Information taken from the Desktop1.4.4.9 source code, method Kill() in Terraria.Projectile.cs.
↑A tick is a time unit countable by the software. Most of Terraria's updating logic happens every tick. A tick has the length of 1/60th of a second, hence there are 60 ticks in a second and 3600 ticks in a minute.
↑Information taken from the Desktop1.4.4.9 source code, method CheckCrackedBrickBreak() in Terraria.Player.cs.
↑Information taken from the Desktop1.4.4.9 source code, methods Kill() in Terraria.Projectile.cs and ExplodeCrackedTiles() in Terraria.Projectile.cs.
↑Information taken from the Desktop1.4.4.9 source code, method KillTile() in Terraria.WorldGen.cs.
Cracked Blue Brick(Desktop, Console and Mobile versions)2
Heavy Work Bench(Desktop, Console, Old-gen console and Mobile versions)
Cracked Green Brick(Desktop, Console and Mobile versions)2
Cracked Pink Brick(Desktop, Console and Mobile versions)2
Boulder
Rolling Cactus(Desktop, Console and Mobile versions)
Dart Trap
Venom Dart Trap(Desktop, Console and Mobile versions)
Explosives
Geyser(Desktop, Console and Mobile versions)
Spike
Dead Man's Chest(Desktop, Console and Mobile versions)
Gas Trap(Desktop, Console and Mobile versions)
TNT Barrel(Desktop, Console and Mobile versions)
Bouncy Boulder(Desktop, Console and Mobile versions)
Life Crystal Boulder(Desktop, Console and Mobile versions)
