Stage 5 of LOGOSGBITS: seven trials in the syllogism — two claims chained through a shared term into a third. One question decides every one of them: could both premises be true while the conclusion is false? If they could, the argument fails, however sensible it sounds.
Each trial is locked until you clear the one before it. Every level scores out of 1000 — 600 for accuracy, 400 for speed — so speed alone can't clear the bar; you have to solve most problems, and quickly. Reach 650 to unlock the next.
You can find the middle term that links two premises, draw what follows by modus ponens and modus tollens, refuse their two tempting shadows, test a categorical argument by picturing the classes — and say plainly when nothing follows at all.