In normal mode, you have to step on the other lit pixel to get 1 point.
In advanced mode, you have to catch the lit pixel to get 2 points. It is going away from you and being controlled by an AI. Each time you catch it, it may respawn in a random location on the screen so you can't catch it again so easily.
You can move the player by using the buttons on the floor. If you press the buttons too quickly, the player won't move at all.
To reset the score, press the "Reset Score" button next to the On / Off switch.
Parts:
Brown wool - an AI
Lime wool - Randomisers
Blue wool - 7 Segment display
Cyan wool - Binar decoders
Gray wool - Program counters
Orange, Yellow and Green wool - Display
Light gray wool - Collision detection
Black wool - Connects the build to the On / Off switch, Reset button, Mode switch