This PSP Mini is about a young vampire trying to take control of an empire of monsters (vampire + empire = vempire) by defeating various monster bosses with a match-4 puzzle scheme, a la Puzzle Quest. However, don't think this is another Bejeweled copycat. Instead of merely swapping out one block at a time to make a match, you match the blocks in a row by rotating a 4 x 4 square of the said blocks. You have to make a specific number of matches in the set time to advance to the next level, and occasionally during the matching process a boss will appear and do its best to thwart any and all matching efforts for a short time. The clock continues to tick, so the bosses effectively increase the challenge and, at times, the level of panic.