Levels
Pick a level to play. Campaign levels continue on to the next one when you clear them.
Random level
Every random level is checked by a solver first: the start is safe, there's no way to skip the lasers, and it can be beaten. Type a seed with the same difficulty and size to replay a level.
Campaign
Your levels
Speed
Slow the lasers down to make levels easier, or crank them up for a challenge.