Great engineering game about running a packet network through tunneled corridors to various bunkers. Use filters and splitters and other doodads to make your network more efficient and prevent packets from traveling to every endpoint in the network. Teaches the basic principles of network design!

If you're like me and just care about the puzzles and the lonely mood, you can turn off enemies. I'd recommend it, honestly, I don't think they add much.

Could use either an endless or rogue-like mode to add a little replayability.