click it but nothing happens

Certain consumables like the tomb and the snowballs have a cooldown and a limit of how you could wisely use them, in some cases if a room has over 50+ mice and in other game modes, then consumables are disabled. It's not a bug but rather a recent update to the game being properly played.

I use tomb like once a day and was unable to use it for weeks. i can use it again tho for some reason.

we cant use tombs till somebody has got into the hole. so its basically another trash downgrade