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I was running along in 1-4 when I missed a jump, and suddenly things went all funky. Well, funkier:

enter image description here

How did I trigger this new, retro-themed level?

How are they different from regular levels? And why did I get a counter saying 1/25 Congratulations when I beat it?

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Possible dupe of this:… – waifu Feb 27 '13 at 1:38
@Retrosaur Not a dupe. But surprised the questions got asked in the order they did. – Raven Dreamer Feb 27 '13 at 1:53
up vote 3 down vote accepted

Retro levels are "secret" levels that can only be found by finding a yellow "game cartridge" in certain levels, as seen below (the picture corresponds to 1-4, which is Windy Interlude).

Now with 420% more freehand!

These are essentially "bonus" levels. They do not affect what score you get in the level you can find the portals.

Once you find a "Retro" level in a certain level, you can always revisit it on the main map screen by pressing "K".

There are also 25 of them out there. Collect 'em all!

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I am so glad you mentioned I can revisit them as that passed me by until just then...! Does the minimap highlight that there is a retro level in it, or do I just have to go into each level and find it? – franglais Jan 9 '14 at 17:36
@franglais Fortunately, yes. There will be a silhouette of a box on the minimap to indicate which levels will have retro levels. – waifu Jan 9 '14 at 17:54
@franglais As far as I know that little cartridge only appears once you've already unlocked the retro level. – Martin Ender Dec 21 '14 at 1:17

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