One Bubble
Ozzie Mercado is certainly a one and only, and One Bubble is the latest in a string of quality simple idea puzzle games. Jumping and eliminating bubbles, with naturalistic backgrounds and soothing music makes for a zen office-toy feel, perfect for an afternoon de-stressing.
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I got really stuck on level 4 until I realised you could jump over two bubbles at one time. I don't think you can solve level 4 without that.
Level 5 puzzled me for a while, so I made a spoiler.
Far right circle jumps two spaces left.
Bottom centre circle jumps three spaces up.
Far left circle jumps two spaces right.
Top circle jumps two spaces down.
Far left or right circle jumps the other two.
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