Unless I missed something, as far as I could see the two game versions are Identical. (I compared CoolMathGames to Kongregate, and also compared the top run in each category).

The rules say that level 2 is changed between versions, but I don't see the difference.

There is a one block difference between the two, honestly I don’t see why it would make too much of a difference especially since we don’t really use milliseconds except for really low times in IL runs. It should probably be brought up with @SayMyName because they were the one that implemented it.

I don’t know what is different with the styncel download

Hmm, now I see the extra block. Wow.

I sent them a message asking about it

By the way, just noticed that level 11 also have one extra block in the coolmath version; That block is blocking the gap in the left side of the level.

This is a very old thread, but the stencyl version does have a very big difference. It has the double jump glitch, when you jump again right after you jumped to gain height. Skips on this version would save a lot of time and it should probably get its own category Here's a vid of me doing level 4 two and a half seconds faster than the IL record using stencyl version

There's not only a difference between level two. You can see in level ten that 1 block has been removed closer to the top of the level in the post-jam non-coolmath version.