I used to undergo the pseudonym of "Delta". Spent weeks on Level Palace; lost interest soon after, but years later I picked up interest in Level Palace again after a rebranding. That's all you need to know.
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Publish a certain amount of levels
Rate a certain amount of levels
Get a certain number of rates on a level
Be a member for a certain number of days. Login required to activate new achievement.
Add unique images to other users' levels (must be relatively new levels).
Get a certain number of contest points.