- Idea: the board game Splendor, set up again as Grandma Ploy's sweet stall
- The technique is taught first: a stamp is a discount forever — buy the cheap thing and the big one gets cheaper
- Every price shows the discount happening — the old number crossed out beside the new one
- Built from 48 watercolours already on disk — lollies, drinks and sundaes become the three shelves
- verify:gem-market plays 600 whole games through the same engine, before anything was drawn
- …and proves the taught rule really wins: 95% against a bot that only hoards stones
- Each of the five stones has its own cut as well as its own colour, and its colour is named
- One to four players on one screen, with a cover card between every turn
- Reaching the goal does not end it — everybody gets the same number of turns
- At the end everybody gets a different honour, for something they actually did
- Three turns of stones with nothing bought and Grandma Ploy names the nearest treat; five and the stall pauses for a breath
- Paint the six stones as watercolours — the facet shapes on screen now are a stand-inplanned
- A gentler two-player mode where a little one shares a stall with an older siblingplanned
✓ = done · ☐ = planned. Every game is built one step at a time like this.