Glowing Hour Glass

Not to be confused with The Hourglass

Glowing Hour Glass is an activated item added in Afterbirth.

Effect

 * Upon usage, Isaac will be returned to the previous room and everything that happened in the current room will be undone.
 * Health, bombs, coins, keys, cards/runes/pills, items, and trinkets will be restored.
 * Certain consumables (such as the ) do not get restored.
 * Score and Time will reset, but about one second will be spent in unskippable animation after use.
 * Event counters will get restored (including Donation Machines, Greed Machines, and ).

Synergies

 * - Allows for infinite usage as the ? Card gets refunded upon usage.
 * The ? Card doesn't get refunded upon usage.
 * 48 Hour Energy pill - Allows for infinite usage as the pill gets refunded upon use.
 * - When the item is double charged and used it will also refund the used extra charge bar, making it possible to use it endlessly.
 * - Using the Glowing Hour Glass after the Bum Friend has picked up coins but before it has spawned pickups will restore the coins in the room but will still cause the Bum Friend to drop pickups. This can be used to repeatedly generate pickups from the same set of coins.
 * - If used quickly after taking damage, Troll bombs will spawn in the previous room. If you have the Safety Scissors, these can be harvested as normal.
 * - Using the Glowing Hour Glass after the Dark Bum has picked up hearts but before it has spawned soul hearts will restore the hearts in the room but will still cause the Dark Bum to drop soul hearts. This can be used to repeatedly generate soul hearts from the same set of hearts.
 * - Allows rooms to be repeated infinitely as long as Isaac has enough health to take two hits, which are refunded on use.
 * - If used after entering the Treasure Room for the first time, upon reentering the room, one item will have changed places and another will be new, effectively making More Options a choice of 3 items instead of 2. If used a second time, the items change back.
 * - Allows for infinite usage as long as you have more than 2 full hearts as the hearts used to charge will be refunded upon use.
 * - Allows Glowing Hour Glass to be used indefinitely without turning into The Hourglass, although it is impossible to absorb a Glowing Hour Glass pedestal without using the item and preventing it from having been absorbed.

Seeds
NDJQ D4GT (First floor treasure room) SRVZ MGKQ (First floor shop, quarter in item room) Y1WR PKCD (Eden spawn) PFTJ B87Y (Second floor shop for 7 cents) 36WC YDYT (First floor treasure room) 07C6 H920 (Second floor item room)