Visit this thread for Crawl:
http://talk.maemo.org/showthread.php...ighlight=crawl

Nethack is best played on Telnet in my opinion.

Ancient Domain of Mystery (my favorite) has a server that you can SSH to with very little trouble.

Best advice is to look into Javispedro's excellent Drnoksnes emulator.

His Super Nintendo emulator has a fierce kick and bite to it that you wouldn't expect the tablet to handle.