Block-o-Mania is a formerly shareware Soko-Ban style game you can find at the author's website (under the tab Abandoned Games):
http://crystalshard.net/?p=8#

The game, originally released in 1989, comes in three flavours, with separate binary executables for VGA, EGA and CGA modes.

The VGA version, which is the default one, crashes on level 6. The EGA version works fine. I've not tested this outside DOSBox so I can't tell how it works on real hardware, but I'd be grateful if someone could look into this to check if it's a DOSBox issue.

What I've tried, unsuccessfully, was reduce the amount of CPU cycles, start the game with loadfix or loadfix -25, reduce memsize to 4, change machine to vgaonly and cputype to 386_prefetch.

The password for level 6 is ioqjnbvn.

I've looked up the issue, users in other forums also report that level 9 crashes in all video modes, but a user has been able to crack passwords for the first 38 levels or so.