Costcodle guide
Updated 2026-09-30. Sources are linked in the text.
The official page explains the rules in one overlay and then gets out of the way. I wanted a place to send friends who ask how the colors work, how I choose a first guess, and why nobody can quote an average score. Those are three different questions, so they are three pages.
Start here
- How to play — six guesses, the 5 percent win, and the 25 percent yellow band, with the sample $10 / $18 / $16 round.
- Tips — the binary-search habit I actually use on grocery prices.
- Scoring — local streaks, the share emoji, and the missing global average.
What I confirmed before writing
On 2026-09-30 I re-read index.html and scripts/main.js. The win test and the arrow characters match the overlay. The game credits Wordle and Tradle in that same overlay, and it credits the Costco Food Database for the products.
When you are ready to try a round, play on this site loads the official game after a click. If you already finished, the answer archive has the shelf price.
Repository facts last checked 2026-09-30. GitHub showed the last push on 2025-10-15.