When you reach a certain score or if you replicate a scene or battle from the series while playing through Battle Zone with your chosen character an enhanced version of your character will become unlocked after you have won the last fight.
When clearing Battles Zones it may be necessary to meet certain conditions to unlock the hidden routes that will enable you to reach an alternate Climax Stage boss. In certain Battle Zones these conditions must be cleared in order to get a 100% rate. Character, items, score, health, and the time taken to finish the fight do not count toward unlocking the hidden routes. For the zones, requiring the combo to unlock the hidden route, the combo can be done anyway possible at any point during the fight, how you finish the fight is irrelevant.
Unlock Ultimate Circle Zone - Stage 1: Defeat Teen Gohan with the Ultimate Attack.
Unlock Circle Zone - Stage 2: Defeat Recoome with the Ultimate Attack.
Unlock Spherical Zone - Stage 2: Defeat Android #14 with a Super Attack.
Unlock Spiral Zone - Stage 3 (Right): Defeat Kid Trunks while in Raging Soul.
Unlock Ultimate Lozenge Zone - Stage 3: Defeat Frieza with the Ultimate Attack.
Unlock Ultimate Spherical Zone - Stage 3: During your fight with Dore land a combo of at least 20 hits.
Unlock Ultimate Spiral Zone - Stage 3 (Left): Defeat Super Trunks with a Super Attack.
Unlock Ultimate Triangle Zone - Stage 3 (Right): Defeat Goten while in Raging Soul.
Unlock Ultimate Final Zone - Stage 3: Defeat Bardock with a Super Attack.
Unlock Triangle Zone - Stage 4 (Left): During your fight with Cell land a combo of at least 20 hits.