Play the NoPixel 5 Key Matrix hack in your browser. Fill the 3 by 3 grid so each symbol appears once in every row and column before the TTL runs out.
All NoPixel 5 hacks
ARAH, All Random Any Hack Firewall Run Memory Diff Traceroute Carrier Tune Port Sweep Handshake Sync Signal Path Cipher Lock Intercept Dong Grinders