Upgrades cost 500G Upgrades RANDOMLY boost not only YOUR HP, but YOUR ENEMIES HP (EHP) AS WELL. It will also boost your POTION (PTN) COUNT. You use PTN in battle to RECOVER 10 OF YOUR HP. Your LEVEL (LVL) is YOUR SCORE. You gain LVL from WINNING. You gain RANDOM GOLD from WINNING. Upgrading does NOT BOOST DAMAGE OUTPUT because DAMAGE IS RANDOM.