Light up Everything

One of my random ideas in about 2020 I think

I don't know how far this game can go, so I didn't code the win condition

Update: someone beat lvl9 so I added it as the win condition

Arrow Keys - Move

X - Switch to place/move mode

Z - Undo

R - Restart from the very beginning

Detailed rules: 

- A level 1 lantern can be placed anywhere already lit

- A level (N+1) lantern can only be placed next to a level N lantern

- The current highest level of lanterns will light up the current level of darkness around it (3x3)

- When a type of darkness were all lit up, the level increase by 1