TxK is an arcade-style shooting game. The basic idea is simple: shoot all the enemies that arrive on each playing surface. When the surface is clear or all enemies arrive at the top, the surface explodes and you transition to the next level.
Use the left analog stick or the d-pad to move the player entity left and right (or clockwise and anticlockwise on connected surfaces). Hold down the x button to shoot. Tap the screen to smart bomb. You get one smart bomb per level. When enabled, press the R shoulder button to jump. Collect Powerups to gain score bonuses and capability upgrades.
Those are the basics! As you progress through the game’s 100 levels you will meet many different enemies with many different behaviours. I hope you enjoy getting to know them and blasting them into a million glowing particles!
For a much deeper analysis of the history and design of TxK I wrote a detailed essay about it on the Llamasoft development blog.