Defendoku

Tower defence with a Sudoku twist.

Slimes and beetles are marching on your castle. Build towers to stop them, but every tower type may appear only once in each row, column and box. Plan your board, start the wave, and hold the line.

Coming soon

A grassy game board with an archer tower, a cannon, a frost crystal and a lightning tower guarding a dirt path from a purple portal to a little castle, with blue slimes and a beetle on the path

How to play

One of each, in every line

Every level is a small puzzle. There's no timer while you build, and every level has been checked by a solver, so a good plan always exists.

Build like Sudoku

Pick a tower and tap a square. Each tower type may go only once in every row, column and box.

Start the wave

Enemies march from the portal along the path. Your towers fire on their own at whoever is closest to the castle.

Hold the line

Let nobody through and spend less gold than par to earn all three stars.

Try it

One Archer rules out every other square in its row, its column and its box (the thick lines). Tap a square to move it.

Another Archer can go here
Blocked for Archers

A Cannon or a Frost tower doesn't mind the Archer. The rule only stops two towers of the same type.

Bright and cosy

A desert level with towers firing at slimes on a winding path — Plan, then defend

An 8 by 8 frozen level with a swarm of bugs on the path — Bigger boards later

Level map of the Meadow world — 100 levels

Daily puzzle screen with a streak counter — A new puzzle every day

Six towers

Every tower has a job

Mix them well. Each one is strong against some enemies and useless against others, and you can upgrade any of them later.

Archer

Quick arrows with the longest reach. Great against Runners and Flyers, weak against armour.

Cannon

Slow, heavy shots that hit everything around the target. Can't hit Flyers.

Frost

Slows every enemy next to it, so your other towers get more shots.

Lightning

Breaks shields, hits Flyers, and jumps to a second enemy nearby.

Poison

Builds up and keeps hurting after enemies pass. Slow enemies soak up more.

Support

Doesn't attack. Every tower next to it fires faster.

Know your enemy

Runner

Fast and fragile.

Tank

Armour shrugs off arrows.

Swarm

Tiny bugs in a crowd.

Shielded

Only Lightning breaks it.

Healer

Mends its friends.

Splitter

Bursts into two Runners.

Flyer

Out of a Cannon's reach.

Boss

Armoured, shielded, huge.

Four worlds · 100 levels

From the meadow to the volcano

Boards grow from 4×4 to 8×8, and each world brings new towers, new enemies and a boss at the end.

WORLD 1 · 4×4

Meadow

Learn the rule with Archers, Cannons, Frost and Lightning.

WORLD 2 · 6×6

Desert

Poison, Healers, Splitters, upgrades and paths that split in two.

WORLD 3 · 8×8

Frozen Peaks

Support towers, Flyers, and boards where only the boxes count.

WORLD 4 · 8×8

Volcano

House rules for each tower, everything at once, and the final boss.

Play your way

Fair puzzles, no pressure

Always solvable

A solver checks every level. Stuck? A hint shows the next good move, and Rewind takes back a wave.

A daily puzzle

A fresh board every day. Keep your streak going for bonus coins.

Ads only if you choose

No banners, no pop-ups. Watch an ad only when you want a reward.

Unlimited, once

One payment makes every level free to play, with free hints every day.

Coming soon to Android and iPhone

Want to know when it's out? Email contact@bitfuzed.com and we'll tell you.