From: United States
Suggestion 1: Read the pertinent archived articles in the PuzzleTimes back issues from September, 2004, to now. Most articles include cross-references to other useful articles. Try these.
Suggestion 2: Click on this forum's Show All Topics. Read and download puzzles.
There will be many useful comments and puzzles for kids to try.
I mention this now, because summer is traditionally the time for finding new things to try in the Fall when school begins again.