For the exact game room you're doing (I'm guessing there are 4 colour pods and each tile has to be able to turn to four different colours if necessary) you'll need 4 loads of 6x6 stacked wired, each with a repeat trigger, furni matches effect and furni condition, sadly I doubt you want to do this as it would cost 19c x 144 (aka a lot of credits).

hey911 uses a similar game in that it has user walks on trigger and furni state effect individually for each tile (8c x 36), also normies' maze has an even cheaper one that uses levers to trigger a full row of colour tiles which is a unique puzzle.

I haven't played Flow so I don't think I could suggest anything better.

You could adjust the banzai idea slightly to make it super expensive again, you'll still need 144 furni matches effects - but you could make it so when the lever is pulled lots of furni matches effects land on top of user walks on furni, this would still cost about 1000c, but the original idea would have cost around 3000c.

agh, we just need more wired really.