This game is titled Beta Bloc in Europe and The Block Kuzushi Quest: Dragon Kingdom in Japan.
Defeat the Zone 7 Boss to complete the game and see the normal ending. Save the game when prompted and get the final orb. Reload your cleared saved game, then complete all seven training rooms. Zone 8 will now be unlocked at the world map.
Defeat the Zone 8 Boss.
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Collect all Medallion fragments and orbs, complete all seven training rooms, and defeat the Zone 7 and 8 Bosses.