
Boss Fight
Failing tests summon a pixel boss, and every fix lands a hit until it's knocked out
A three-lane endless runner in a pane beside the transcript

Run /subway and a pane opens on the right of the transcript with a night skyline and three lanes of track running toward it. Click the picture and run: change lanes around trains, jump the low barriers, roll under the high ones and pick up coins. When Claude finishes its turn, the picture dims and a yellow "Claude is done" banner appears across the track, so you know the reply is in.
/subway opens the pane. Run /subway again, or /subway stop, to close it.
Failing tests summon a pixel boss, and every fix lands a hit until it's knocked out

A T-rex runner in a pane where Claude's tool calls become obstacles

Tower defense where every enemy is one of Claude's real tool calls

Nine games and a pet above the prompt, paused when Claude finishes its turn