This probably sounds silly coming from me, given my entry, but as a point of clarity I’d recommend, instead of “Module 0/1/2/3”, having the Modules be 1, +, ×2, and T (or some other indicator of “Target”). Once you know what they are, it’s a game about entering binary numbers. I don’t know that yellow-to-blue really reads as source-to-sink, and I’m not sure there was ever a time when the “wires cannot cross” constraint was relevant. Fun to quickly push through.