Choo-Choose: World Train Royale

This is rather cute: World Train Royale is roughly equivalent to PuzzleQuest with trains. The match-3 part of the game is you gathering resources to ship to parts of a fantasy-Steampunkish Empire, which allows you to head out across the map and gain connections to other towns and cities. You can get the trial version of the game here, which is good for an hour's play. I'd be surprised if many people exceeded that, but the picture-book art-style might snag of few of the kids.