4-Color Puzzle Simulator is a focused training app for falling-block puzzle players who want to build stronger chains. Its built-in AI suggests the next move as a ghost piece while you practice classic foundations like GTR, FRON stacking, and Sub-GTR. With endless practice, chain animation, and a fast custom C++ engine, it helps beginners learn placement and advanced players sharpen big-chain accuracy anywhere.
BPM Finder for Runner helps runners build playlists by tempo instead of guesswork. Set a BPM range, filter by artist, and find tracks that match jogs, tempo runs, or intervals. It also supports double/half-time BPM matching, shows results clearly by BPM, and works with an offline database—no Spotify login or music account required.
