Deduction puzzles for developers, for while the build runs. A new one of each every day, and you can take as long as you like.
Alerts cascade through a service graph. Check logs and attempt fixes to find which services actually broke, before the downtime adds up.
CI is red because of hidden order dependencies between tests. Design runs to find them in as little CI time as you can.
Rotate hex tiles to route red, green and blue light so each receiver gets exactly its colour.