Stage 3 of LOGOSGBITS: seven trials in the proposition — what a definition becomes once it is asserted. A definition only fixes a meaning; a proposition claims something, and so can be right or wrong. Name its form and you know exactly what would refute it.
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 take any categorical claim apart into its four pieces, name its quantity, quality and form, and say precisely what would deny it — which is the difference between refuting a claim and merely contradicting the person who made it.