Round 1
With 15 players alive, there are 5 rooms.
Room choices:
Gravity - A random person who did not pick this will change to this room.
Life - If nobody picks this, everybody dies.
Multiply - Everyone who picks this counts as two.
Protection - All pickers are immune to death this round for any reason other than the majority. A random picker becomes a bodyguard.
Rejuvinate - Everyone who picks this becomes healthy.