The game offers 5 stages. Players may start at any desired stage by using the correct passwords
While the general direction is linear there are some dead ends needed in order to obtain keys, then backtracking.
Stage four is unique in offering two different paths - one filled with bomb triggered puzzles and one more action oriented. The split occurs in a puzzle filled room, which can either be solved and lead to more puzzles or ignored by going to an open right door towards the action.