Step 1: Generate any QR code.
Step 2: Move your avatar around (Recommended use of: Numpadkeys: 7,9,1,3 or for less intuitive controls: WASD) and Lower/Raise blocks by pressing SPACE.
Step 3: Connect Grey blocks to Colored blocks to light them up.
Step 4: Light up the 3 Beacons.
Step 5: Do this with as few blockChanges as possible.