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.