More recently I have been working on Bog Gobbler, which is a variant of Boggle where you capture territory by finding words in the grid. The territory-capture element is much more relevant in the multi-player game, but also affects the mechanics of solo games.
This one is a little more popular and there is a daily solo challenge where everyone plays the same grid, with a global and personal leaderboard.
You can go directly to the daily challenge at: http://crosswordislandhopper.com/dailyChallenge
If you know how to play Boggle the one thing you need to be aware of is that after the first word you find, all subsequent words must include at least one letter that you already "own".
