How to play
Pen: drag on the paper to draw walls (1 ink per cell).
Tower: click a cell to build a tower that shoots squids (10 ink).
Glue (15 ink) slows nearby squids; the Sniper (20 ink) hits hard from far away.
The Bucket (25) splashes groups, the Spray can (25) jumps between squids and Anti-air (15) shoots only flyers.
Eraser: rub out walls and towers for half their ink back.
Pick an ink under the tools: red burns squids, marker can't be erased and stops flyers, pencil is free but fades.
Click a tower to upgrade it (up to level 5) or sell it. Point at a tower to see what it does and how far it reaches.
You start with Tower and Sniper; the others unlock as the waves go by.
Two different towers next to each other, both at level 5, can merge into a stronger double tower that shares their tricks and upgrades to level 10.
Press Auto to have each next wave start by itself.
Leave them a way through, and survive 50 waves.