Heya, so when you "roll dice" you are given a set amount of time to "mine" dice. And each go costs you a dice. If you don't return by the time the timer reaches zero then you lose the dice you have collected on that run. Meaning the deeper you go, the bigger the risk :) This should have been made clearer in the game. I think it's a fun mechanic though as it makes buy upgrades a real necessity. Anyway, thanks for playing :)