Reference article
Arcade (Duck Life 8: Adventure)
The Arcade offers all 80 training variants and develops a separate avatar for Arena competition.
Selecting a game
Choose one of 16 beginner/pro training games and one of its five variants. Spend 
Arcade Tickets to play. The Arcade stores bronze, silver and gold score progress for each variant.
Separate avatar progress
Arcade XP increases avatar stats rather than the story duck’s stats. The inspected Arcade XP path caps each avatar skill at 500. The White Star badge requires level 100 in all eight avatar skills.
Completion goals
See 
Arena Badges for score and avatar milestones.