Maru Kaite Dokan!

A tower defense where what you draw becomes your weapon. With 2–8 friends, guard your own notebook and send them your drawn masterpieces. Scribble a spiral for a Spiral Turret, a skinny triangle for a Pizza Mine. Secret doodles hide in how you draw, and the numbers inflate without end.

Your friends' masterpieces are invading your notebook

Play with 2–8 friends, each defending a notebook of your own.
Mid-match, draw a "masterpiece" and it marches into every friend's notebook as a walking fortress. Circles become cannons, squares become armor, lines become legs.
"Taro's masterpiece 'Rice Ball with Twelve Legs' is invading!!"
Knocked one down? Draw around it to frame it, and it rampages on your side for a while. Your friend gets a little "Published!" reward too. Last notebook standing wins.

Draw it weird, find a secret doodle

Circles are turrets, lines are walls, triangles are mines. Draw them a little differently, though, and they turn into something else.
Scribble a spiral for a "Spiral Turret" that sends enemies spinning. A long, skinny triangle becomes a "Pizza Mine" that enemies crowd around to eat. A wide rectangle becomes a "Futon" that puts them to sleep.
Try strange strokes and fill up your collection.

Numbers that never stop growing

Pick an upgrade card after every wave you clear.
Damage climbs from thousands to millions, billions, trillions, quadrillions… and far beyond.
Clear the last wave and it goes on endlessly, the numbers getting ever more absurd.

Stop time and paint a masterpiece

Use the Masterpiece Brush and time nearly freezes while you draw as many lines as you like.
Your strokes become a single masterpiece, and the more ink you pour in, the harder you hit for the rest of the wave.
Spend a huge amount of ink in one stroke and that counts as a masterpiece too.

Every line becomes a body

Circle → Turret. Bigger circles reach farther and hit harder. Draw over a turret to upgrade it
Line → Wall. The longer, the tougher
Triangle → Mine. Sets off the mines around it
…and more shapes, more defenses

A lumpy "Potato Turret" may misfire now and then. That's part of the fun.