
As such, rooms can be re-entered (using Sharp Key itself or with Door Stop / Mercurius etc.) before they're fully cleared to repeatedly get rewards from the same enemy.
Whether or not an enemy gives chest contents when killed by Sharp Key is seeded per enemy. Thrown keys will retain Isaac's tear/ status effects, but are unaffected by items that replace Isaac's tears (such as Dr. Opening locked chests with thrown keys in Challenge rooms will not cause the challenge room to start spawning enemies. Despite Mega Chests requiring keys to unlock, Sharp Key has no effect on it. In the case of Eternal Chests, thrown keys will only count toward opening the chest one time. Only locked chests (such as Locked Chests, Eternal Chests, or Old Chests) can be opened by Sharp Key all other chests are unaffected. Thrown keys will open all the locked chests they move through, allowing multiple chests to be opened with a single key. Despite being a substitute to bombs, thrown keys will not destroy Shopkeepers. Destroying a rock will create a bridge at the opposite side the thrown key hit the rock from. Thrown keys cannot pierce or destroy Stoneys. Thrown keys can also destroy Angel statues, but not Blue Fire Places. The only rooms Dad's Key can open that Sharp Key cannot are Challenge Rooms, Boss Challenge Rooms, and the Boss Rush door from the inside. Doors will be opened in one thrown key, even if they require multiple keys or bombs to open. However, it cannot be used as a substitute for Red Key or open the doors to Boss Rush or ?. Thrown keys follow the same unlocking rules as Dad's Key: They can unlock Secret Rooms, the doors to access Mines, Mausoleum, Mom's Heart in Mausoleum/Gehenna, Mega Satan, and A Strange Door. Sharp Key gives Isaac five keys for the price of three when bought at a Shop, making its purchase a good value if the player is low on keys.
Enemies killed by Sharp Key have a chance to spawn the contents of a chest the contents they can drop includes the rewards of any possible chest contents, including items.The thrown key does damage equal to 5x Isaac's damage + 30.The key will also break the first rock it hits, as well as Key Blocks.The key damages enemies, as well as opens locked doors and Locked Chests it hits. Pressing a fire button removes one key and throws it as a piercing projectile. On use, Isaac holds a key above his head.