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So I got a prompt to level up as soon as I beated stage mode. The menu for level up was active but hidden behind the Cleared Stage menu, and as soon as I made a choice the game kept going with the ending screen active, but untouchable. The game continued in this state and I couldn't level up or touch anvils, but the score and money kept being updated on the ending screen. Once I died, the Game Over screen appeared behind the Cleared Stage screen and both where active. Don't know if it's a rare occurence or not, but it was a fun experience.