From GameBrew - a wiki dedicated to Video Game Homebrew.
Jays XWords is a collection of Crossword puzzles, with a usable interface for DS. There are 3479 crosswords in the game.
Each one’s selectable from the title screen, and playable whenever you want. Pick a level and play it. Reds show up where you’ve got a letter wrong.
Only one save is available which saves the last puzzle you were playing.
Start - Menu and save
Stylus - Select word