Tower Defense...unlimited mode?

[BadKarma68]

I have started to try some of the tower defense games. Tanks and Turrets is pretty fun.

It is frustrating though, I got to level 99 out of 100 and lost...ack.

Is there a way to play games like this without having a limit on how many enemies can slip thorugh? Sometimes I just want to play casually (like Bejeweled in endless mode).

Thanks.