I.out [美 aʊt, 英 aʊt]副out often appears as the second element of certain verb structures in English (come out, keep out, knock out, etc). For translations, see the relevant verb entry (come, keep, knock, etc).
Puzzle-based games pad out game length all-too-often with annoying busywork, which you have to trudge through once you've already worked out the solution.