GAMESLASHSlapjam #2: AI vertical web game challenge, 48 hours, late October.
By GameSlash
A free 48-hour competition accepting portrait HTML5 games made with AI tools, with a $1,000 total prize pool. Builds cannot be changed after the deadline.
Slapjam #2 opens a web game development competition using AI tools from October 29–31, 2026. This round specifies that games must be playable on vertical phones. Participants may work alone or in teams, and entry is free via itch.io.
The game development period begins at 15:00 UTC on October 29 and ends at the same time on October 31, corresponding to 22:00 local time in Thailand on both days. The theme will be released at the start of the event. Participants must export their game as HTML5, upload it so it can be played via a browser, and specify the AI tools used.
Three scoring criteria and a deadline after which builds cannot change
Judges scored fun, visuals, and theme adherence with equal weight. First place prize is $500, second place $200, and third through fifth place $100 each.
The organizer will close judging on November 7 at 15:00 UTC and will not accept any build fixes after the game submission deadline, even for bugs that make the game unplayable. Participants should therefore allow extra time for testing on their phones and verify uploaded files before submission.
Rules and image credits: Slapjam #2 · Slapjam Media Kit