An endless game mode where you fight in boss zones from different maps. After each round, all types of merchants appear:
"Wandering Trader" or "Galba Machine" for jokers
"Anvil" to upgrade our weapon stats
"Dr. Spark-Twist" for our hero stats
"Fortuna Bluff" for skills
Every 5 or 10 rounds, a boss appears, and possibly even 2 bosses once a certain number of rounds is reached. The further you progress through the rounds, the higher the difficulty increases.
The higher the number of rounds reached, the greater the rewards.