Item description:

To understand POWDER, you should first understand roguelikes. "Roguelike" is a term applied to a wide variety of games which share a common inspiration from the game Rogue. A non-exhaustive list of such games would be: ADOM, Nethack, Crawl, Diablo (I & II), Moria, and Angband. My apologies to the many excellent roguelikes I didn't list. What characterizes these games? The exact specifications are a matter of debate - indeed, I may receive hate mail for including Diablo - but I shall try to write a few:
Tactical play. The unit of action is based on the individual adventurer. The game is not twitch oriented (like Quake, rewarding reflexes & well trained actions) nor is it strategy oriented (like Civilizations or Warcraft, requiring working on the large picture)
Based in Hack and Slash. A roguelike isn't primarily about plot development or telling a story. It is about killing things and acquiring treasure.
Random games. A roguelike is a dungeon crawler where no two games are the same. The maps are different, the items are different, there are no guaranteed win paths.
Permadeath. You die, that is it. No restoring a savegame. Good roguelikes delete your save game after loading them. This is compensated by the replayability of the game.
Complex interactions of properties. While the commands for a roguelike are simple, the potential interactions are not. My favourite example is equipping a silver ring as a weapon in order to damage a creature vulnerable to silver, but not one's other weapons. [Editor: This matches the Hack branch of the roguelike tree, not the Angband branch]
Steam rolling monsters. If a critter is in your way, and weak, you shouldn't even notice it is there.
For more information about roguelikes there is the Rogue Basin, a Wiki documenting this genre, and the Temple of the Roguelike, a newsite tracking developments in the field.

Having defined Roguelike, POWDER is easy to describe: A Roguelike designed for the Gameboy Advance and Nintendo DS.

How to Win
Descend into the depths of the dungeon until you reach the foul daemon known as "He who the author cannot spell consistently", or, Baezl'bub. When you have slain Baezl'bub in heroic combat, or, if Baezl'bub dies in any way, retrieve his black heart and bring it to the surface world.
You may then go the nearest newsgroup such as rec.games.roguelike.misc, and post YAAP (Yet Another Ascension Post).

Nintendo DS Version
Two files are present, a .ds.gba and a .nds. Depending on your solution, you only need one of them. If in doubt, use the .nds file. POWDER supports DLDI so you can, if needed, patch it to support saving. During start up it prints out if it found a FAT filesystem - if it found one saving should work. If it doesn't find one, saved games will not survive a power cycle.

All auxillary files are saved and read from /DATA/POWDER, regardless of where POWDER itself is copied onto your flash drive. That directory will be created if it doesn't exist. If it fails to create, it will default to using the current directory of POWDER.