Using the mouse, move the Katra around the edge of the board.

Click the mouse to drop the Katra.

The wormhole will suck the Katra from your grasp if you run out of W.R.A.X. power, so drop pieces quickly!

Get 3 similar Katras in a row to clear them. The more Katras you clear with one drop, the more points you get.

You must clear a certain number of Katras to finish each wave.

If you drop too many Katras in a row without clearing any, the wormhole will overflow and belch out another row of Katras. Make sure to check your overflow meter!

Use the Catalyst to clear a group of pieces, no matter what Katras they belong to.

Catalyst Nova Bonus: If the Catalyst is dropped into the center of the wormhole itself, it will create a Nova explosion and clear the entire first row of Katras!