Custom maze TD

Anybody know the name of the custom game where you have to build a maze with pre-laid out towers for creeps to maneuver through? It’s like different rounds of preset half built mazes and you need to finish the routes.

Might be Gem TD youre thinking of? i think theres a poker version too

There is a ton of good tower defense maps out there. A notable one I recall is Elfus TD - Dalaran Harbour. It actually had a nice terrain, instead of plain lifeless corridors and overall was more colourful than most maul maps I played.