01
Sign up and install the app
A Spare account comes with $100 in AI credit, usable in the desktop app only.
Challenges · Round 1
A waiting game for under $1
Build a 1–3 minute game with AI for under USD 1 in total model spend.
How it works: each round has a theme and an entry window. Build a small piece that fits the theme during the window and add the round’s tag when you submit. That is your entry.
- Window
- 14 days2026-09-26 – 2026-10-09
- Spend cap
- $1
- Per round
- 1–3 min
- Tag
- #challenge-1
How to enter
in three steps.
Build in the Spare desktop app so spend and time are recorded by the client. You never type them in.
02
Make a small piece
An HTML game or fidget toy with 1–3 minute rounds that can pause anytime, under the spend cap.
03
Tag it and submit
Upload the ZIP on Publish and add the tag challenge-1. It joins the leaderboard once reviewed.
Rules
- An offline HTML package that meets the usual publishing rules
- Built in the Spare desktop app, which measures spend and time (new version in development); spend under $1
- Tag it challenge-1
- Rounds last 1–3 minutes and can pause anytime
How ranking works
Saves÷spend (USD)=score
Entries must be built in the Spare desktop app, which records spend and time. Ranked by saves ÷ spend (USD).
Example: $0.50 spent and 20 saves gives a score of 40. Spend less and get saved more to rank higher.
Measured by the Spare desktop app.
Leaderboard
No entries yet
Shown once 3 entries have desktop stats.
Reference works
for the length.
1–3 minute games and fidget pieces already on the site. Open one and play.
USD 100 AI credit
Given at sign-up, usable in the Spare desktop app only.