Translate the sentence from a word bank, then watch it bounce back through reverse-translation, drift and all.
You are shown an English sentence and a bank of words in a small constructed language built just for this game. Assemble the translation by picking words in order. Your version is graded against the canonical alignment, then mapped back toward English so you can see how much meaning drifted on the round trip. Tight word choice keeps the meaning intact.
Rosetta Relay teaches translation thinking using a self-contained invented language, building real linguistic reasoning.
Translating into a small constructed language built for the game is the technique of linguistics olympiad problems: a novel system with regular rules, solvable from examples alone.
Using an invented language rather than a real one is the original choice.
It is a fair choice because it removes prior knowledge entirely. Nobody can have studied it, so the puzzle tests whether you can infer a grammar from data — which is the actual skill, and one that a real language rewards having already learned instead.
Rosetta Relay is an original, free browser game that teaches translation thinking using a self-contained invented language, so the answers are exact. It is built in-house and runs online.