Organisms

The screens the app is built from — the game hub, the teaching harness, the skill map, the paywall, and the app shell. Compositions of the atoms and molecules on the shared tokens.

Composed, not primitive These are assembled from the atoms + molecules — so the Flutter mapping is the same story one level up: each is a Stoa* screen widget built from the widgets those pages describe, on the shared tokens (ADR-0008). Fixtures are fictional placeholders.

Game hub

The multi-game picker — the catalog the subscription unlocks. Status drives the visual: learning, available, new, locked.

American Mahjong

Learning · 64%flagship

Canasta

Newcard family

Riichi Mahjong

Lockedcoming Y2

Bridge

LockedPremium · Y3

Lessons & drills

The teaching harness — shared across every game. The drill's explanation is the product, not just the verdict.

Lesson list

✓

Meet the tiles

Suits, honors, jokers & flowers

Done

The Charleston

Passing tiles to shape your hand

64%

Reading the card

Picking a target hand (your card)

Drill prompt

Charleston · first pass

Which three tiles should you pass right?

5 5 ● N ● W 9

WhyN, W and the lone 9 don't combine with anything you're building. Passing them keeps both pairs and your dot run alive.

Skill map

The tiered, progressive curriculum. Brand-aligned tier ramp — Foundation neutral grey → Core brand orange → Advanced deep — set by --sg-tier-*. Each row: a number badge, the title with its state on the same line, and the objective + meter below.

FoundationFree

1 Meet the Tiles✓ Mastered Recognize the suits, honors, jokers

CoreSubscription

3 The CharlestonIn progress Pick the three tiles to pass Level 2

AdvancedSubscription

11 Full-Hand IntegrationNot started Play a whole hand end-to-end (capstone) 12 Table-Reading & Odds Count tiles, joker scarcity

Paywall

Annual "course + practice" subscription. The All-Access tier is featured.

Single game

$39.99/yr

American Mahjong, fully taught
Lessons + spaced-repetition drills
Card companion mode

All-Access

Best value

$49.99/yr

Every game in the catalog
New titles as they ship
7-day free trial

App shell

The frame around every screen — the top bar, bottom nav, and a bottom-sheet — shown in a phone frame.

App bar — back + centered title (detail screens)

Continue

The Charleston

Reading the card

Up next

Save your progress

Create an account and your lessons, streak, and card prep follow you to any device.