Gold Rush mode only appears on the PSP versions of Tekken 5: Dark Resurrection and Tekken 6. In this mode, you must deal damage to your opponent as many times as possible within 30 seconds. Each hit adds up the gold value. If your opponent hits you, you will lose some gold. The higher the difficulty, the more gold you get when you hit your opponent. If your opponent knocks you out, you will lose everything and the game ends. After 30 seconds, you will receive the gold value from the results.
Trivia
In Tekken 5: Dark Resurrection, this takes place at the Galleon, and in Tekken 6, this takes place at the High Roller's Club.