Wave 01
Build Wee Ninja huts on squares 1 and 3, and an Anti-Ninja
hut on square 2. Fast-forward to start the demons. At the end of the
wave build Sniper Ninja huts on squares 4 and 5.

Wave 02
Relax.

Wave 03
At the end of the wave, upgrade your Anti-Ninja hut twice.

Wave 04
Relax.

Wave 05
Build an Anti-Ninja hut on square 6 whenever you want.

Wave 06
At the end of the wave upgrade both your snipers.

Wave 07
Relax.

Wave 08
Upgrade your Anti-Ninja hut on square 2 twice, and upgrade your Anti-Ninja hut on square 6 once.

Wave 09
At the end of the wave upgrade your Anti-Ninja hut on square 6.

Wave 10
At the end of the wave upgrade your Anti-Ninja hut on square 6.

Wave 11
At the end of the wave upgrade your Anti-Ninja hut on square 6.  Both of your Anti-Ninja huts should now have 5-stars.

Wave 12
Build an Anti-Ninja hut on square 7 as soon as you can, and keep upgrading it while there are only one or two Super Wee Devils on screen. When the third Super Wee Devil appears, stop upgrading your Anti-Ninja hut on square 7, and be ready with your wind special power just incase you need to slow the Super Wee Devils down.