Microsoft released Tinker a game originally on the Windows Vista Ultimate extras disc for free. This is a newer version of it to promote there Windows Live Games its a small download only 60 MB and for you with gamertags it has 200 just like an xbla game
get it here http://www.microsoft.com/games/en-us/Games/Pages/tinker.aspx
i just installed it and was downloading my gamertag to the gwl app so i have not played it yet. but hey ots a free puzzle game
