Splat Square: http://www.primarygames.co.uk/pg2/splat/splatsq100.html
Ambleside Teaching Grid: http://www.amblesideprimary.com/ambleweb/mentalmaths/countersquare.html
Number Grid: can not find original source, please let us know if you find it
Crickweb Number Grid: http://www.crickweb.co.uk/ks1numeracy.html
Splat Square Reveal: http://www.primarygames.co.uk/pg2/splat/splatre100.html
BBC Mend the Number Grid: http://www.bbc.co.uk/schools/numbertime/games/mend.shtml
Square Dectectives: http://www.sumsonline8.co.uk/
Number Grid Puzzle Maker: can not find original source, please let us know if you find it
Give the Dog a Bone:http://www.oswego.org/ocsd-web/games/DogBone/GameBone.html