Hey! I am RequiemZap
Currently i am making a horror game
you need to light up 4 candles so you can escape
so the problem is that i don’t have any ideas for puzzles
–What I am Doing–
So Basically i need to do 1 puzzle to light 1 candle
i got 1 idea on my head Which is to write Password you need to find Password around the map
—What i need–
i need ideas for puzzles and that’s it
i appreciate your help 
Hello sir. 
Theres plenty of varieties for puzzles, as for myself I also work on a Horror game so I don’t mind giving you a small direction anyway, You could make a puzzle for example with pieces that build up to reveal a Code / Map, You could make a certain puzzle that requires 2 players doing specific stuff at the same time maybe triggering wires or something like that, Just make sure the puzzles make sense and connect to the lore of the game ! 
That’s all for me, If you wish for more assistance I’m more than happy to assist you !, Good luck on your project. 
Since you say the genre is Horror, then why not make something in correlation with the candles and horror. Like lets say the candles are to stop a monster from being summoned but with it’s limited power it’s trying to stop you. So, you have to play it’s game 4 times to light the candles and beat it.
tip, you should put purpose behind each puzzle and not just randomly put confusing puzzles as I see most games do.