The destination words — games, quests, celebration. Play is not a break from the work; it is what the work is for.
The marking of a good thing so it is not passed over. Celebration is attention given deliberately to what went right.
A cylinder whose lettered rings must be turned to spell the word that opens it. A coined word, crypt + codex. The container and the password are one object: the answer is not kept inside the lock, the answer IS the lock.
The deep and the dense — a thicket, a depth entered rather than viewed. Sanskrit, गहन. What is gahana is not hidden; it is thick enough that you must go in. This house's game: a world walked, not watched.
A bounded activity with its own rules, entered freely. A game's stakes are real inside it and chosen from outside.
Activity done for its own sake, inside chosen rules. Play is not the reward for work; it can be the destination.
A bounded place made for trying things freely. Consequence is suspended on purpose so that learning can happen.
A seeking undertaken deliberately and at cost. What separates a quest from a search is that the seeker is changed by it.
To mix into disorder, and also to move over rough ground on hands and feet. One word for two motions: what is scrambled has been disarranged, and the one who scrambles is working to cross something.
A Latin square played as a puzzle: each figure appears once in each row, column and box. Japanese, 数独 — short for 数字は独身に限る, "the digits must be single." The constraint is the whole pleasure.