Infested Cracked Stone Bricks are a hostile-Silverfish trap block in Minecraft that looks pixel-for-pixel identical to normal Cracked Stone Bricks, only revealing the danger when a player breaks the block. The block does not generate naturally anywhere in the world, not even in strongholds or igloo basements, so survival players almost never encounter Infested Cracked Stone Bricks unless a Silverfish has crawled into adjacent Cracked Stone Bricks and converted them. A Silverfish (a small hostile arthropod mob) hides inside the block and bursts out the moment the block takes damage, immediately attacking the player who mined it. Hardness measures only 0.75, so Infested Cracked Stone Bricks break far faster than the regular Cracked Stone Bricks value of 1.5, and blast resistance of 0.75 leaves the block eight times weaker to creeper and TNT explosions than the genuine 6.0 stone-brick figure.

Players obtain Infested Cracked Stone Bricks exclusively from the Creative inventory, because no crafting recipe exists and the block never spawns in generated structures. Mining the block with a Silk Touch pickaxe (an enchantment that drops the block itself) is misleading: Silk Touch on Infested Cracked Stone Bricks actually drops ordinary non-infested Cracked Stone Bricks without spawning a Silverfish, so the infested block cannot be collected in survival. Breaking the block with any other tool drops nothing and spawns the Silverfish, which then summons nearby hidden Silverfish from surrounding infested blocks. Builders use Infested Cracked Stone Bricks in Creative prank maps and adventure maps where a hidden trap adds tension, because the cracked-stone-brick texture blends into any stronghold or ruined-portal aesthetic.