I just realized what's happening... If you finish a game of easy, and then hit "options" instead of restart it saves your highscore for the level you choose. That's how come the scores are so high for impossible and hard. I didn't realize before because I wasn't looking at the highscores until you commented on it!
I played this game a lot when I was a kid - and I wrote a program to play this game automatically in uni. Trick is to always have at least 1 open slot on the board - never use it if you can't delete the card you move into it. It's better to have two if possible. But that highscore was just luck as well.
Thanks for updating! Giving extra gizmos after each hand makes the game too easy though I think. Hard is pretty easy now and I think I can play forever on easy and normal.
I hadn't noted the -1 per undo. I like that idea for sure. I'd add it to "fours" if I was you as well. I see what you mean though about the gizmos. Maybe it's better you can't get them back with an undo but, in my opinion, the -1 to score is punishment enough. Especially when you are on hard and only have 1 of each.
World 2-3 is bugged. Worked properly but I died. When I restarted a game there the moving platforms disappear and reappear. Sometimes I can bounce on nothing as well in that level. Good game though other then that!
Wow, this game is soooo much harder when i can't cheat like I do in real life. 5/5 because I like your options you added. When you hit "undo" it doesn't give your move and deletes back to you though. Is that supposed to work that way?