JAXILLMIND FAMILY · Game 4 / 12
MUST BE TRUE
Deductive Reasoning
L2 · Understand
Item format modelled on conditional-inference items — must be true, might be true, cannot tell.
Is it true? Tap ✅ or ❌!
Level 1
Right 0
❤️❤️❤️
Tap Start to play — spot the answer!
Keep going — this game grows with you
- L2 Understanddecide whether the statement is true
- L4 Analyzefind the ONE word that makes a false statement false
- L5 Evaluaterank three statements from most to least certain
- L6 Createwrite a statement that is almost-but-not-quite true
Starts at L2 · climbs to L6 — analyze, evaluate and create, not just remember.
TTCF — capability · time bar · failure mode · detection
| Capability | TTC | Failure mode | Detection |
|---|---|---|---|
| node → complete PWA compile | 1000ms | LLM leaked or transform > 1s | measured compile ms > 1000 → RED |
| every claim + option renders | 50ms | option dropped or not one correct | options emitted == node AND one correct per challenge |
| offline play after first load | 50ms | precache drifts | targets ≡ PRECACHE ≡ disk |
| wrong tap costs a life; three ends run | 50ms | lives never decrement | livesLeft-- + gameOver at 0 |
| best streak survives reload | 50ms | localStorage throws | every localStorage touch in try/catch |
| tones via WebAudio | 50ms | AudioContext before gesture blocked | AudioContext only in a gesture handler, try/catch |
Source: products/xml/games/true-or-false.xml v0.6 · engine "choice" · compiled by gen-brain-game.mjs · gated by check-brain-game.mjs