From the original Dungeon Twister game rules:
All used Combat cards are removed from the game. Gather them in a single face-down pile. Players are not allowed to look at these cards.(The jump cards go there too)
You're also not allowed to look at the Action cards and the tokens you placed at the beginning of the game:
It is strictly forbidden to look at any token that has already been placed in a room (even your own!).
All of a player’s Action cards must be stacked together face-up, so that only the last card played is visible.
You are not allowed to take notes when playing in a tournament and I would suggest you play it the same way at home.