Combo room
In this room, you can easily make high combos by killing endless blue skeletons. The 150 hits achievement and the combo requirements of flame face to unlock abilities become a piece of cake!
You can unlock this ability (4500coins) before you enter this room to make it even easier.
When you finish a 100 hits combo, you can jump into the green pool to reset your combo and start a new round. It won’t hurt!