Fishdom H20 kept my 8-year-old daughter and me happily engaged for a full 60 minutes, and there were howls of protest when the demo ended. Despite her tearful and desperate pleas, however, I'm not willing to pay the $20 license fee. On my test laptop--which just barely meets the minimum system requirements--installing the program took almost an hour, and the game gobbled up an inordinate share of system resources. Even after I shut it down, my laptop ran slowly until I uninstalled the program and rebooted. As we played the game, the cut scenes were animated poorly and did not run smoothly; game play was fairly smooth, however.
If you have a relatively new computer with a fast processor and a generous amount of RAM, you might have a better experience running Fishdom H20. The game is certainly enjoyable and terrific for children, requiring critical thinking skills, basic math, budgeting, and problem solving. I suggest trying out the demo on your system before plunking down the license fee.