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The unlock bug is due to the fact that when you retry some of the levels and beat them again, you get the max score rather than the difference between your old and new scores.
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I've noticed some bugs. When you test a level and slide the ball into the goal, you get the "exit to main menu" achievement. Also, sometimes some of the unlocks become available even when you don't have enough points for them; then, later on, they will be locked again.
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If you're playing during the day and you want to get the "play at night" achievement, simply change the time on your computer.
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6th commenter XD But seriously good game i found out that as you go on you will have a really hard lvl then a really easy lvl i guess that is just to make you feel good about yourself XD.