Four Player Light Cycles in ZX BASIC

Four Player Light Cycles for the ZX Spectrum, controls are:

• Q, W: rotate the red light cycle
• O, P: rotate the green light cycle
• N, M: rotate the blue light cycle
• Z, X: rotate the yellow light cycle

Here's how it works:

Line 10 - draw the border of the arena and set up the increments for movement

Line 20 - set up the initial position / colour / controls for each cycle

Line 30 - loop through all live cycles

Line 40 - display cycle trail, update cycle position, check for collision

Line 50 - display cycle, check for anti-clockwise controls

Line 60 - check for clockwise controls

Line 70 - loop until only one cycle remaining

Line 80 - display game over and cycle rankings. pause then restart

Line 90 - initial data for cycle position / colour / controls