I think that's the java computer they have here?
I've played it a few times. Sometimes a high level will suddenly make many big blunders.
Sometimes a low level will make many strong moves in a row.
Remember every level is the same engine. I think one of the things that determines the strength is it's set to randomly choose bad moves sometimes. So if you're unlucky a low setting will play well for a while, and if you're lucky a high setting will blunder a lot of material now and then.
Except level 10, I think that's full strength with no random bad moves.
I have seen, the computers have become harder. Is it true?