[EricH]

Someone mentioned that Joe DiMaggio's number was 5. He has the record for the most consecutive games with one base hit or more (56). Noting what appears to be a goal from '05 in the lower right, and knowing the hint from then and the game name had to do with baseball (not to mention the "diamond" "plate"--both baseball terms), I'd guess that the game will be similar to a baseball game in at least one element.

My latest guess: game piece softballs, some form of base somewhere, played something like '05.

I'm probably way off. Dave and the GDC pulled a good one. I bet a riddle would have been too easy for us to figure out, so a simple game? My head is hurting badly...

Edit: I meant most consecutive. (Sorry, mikemax.) Although could acutally be that way...
Edit2: Indysam was the one who caught Joe DiMaggio's number--back in post 38.