Here’s an internet game that you can really only play online: What Did I Search For?. You’re shown the Google results page for a one-word search, with all occurences of the search term omitted, and have to guess the search term. Yeah, you could cheat, type in the URL of a returned page, and find the elided term from the blurb, but that really misses the point. It took me a while to get the hang of it, but now I’m well hooked. And, as a bonus, as you keep playing you are “rewarded” with links to pretty pictures or, eventually, other games on the site – I just won the featured bonus game of Frogger!