It has been found that the game version on the website "engineering.com" is different than the others, with different physics. Full-game runs which are done on engineering.com, now have their own leaderboards in the relevant subcategory.

For ILs: Only runs which are done on the engineering.com version or Mobile version are allowed. Those two are the only versions which contain an in-game timer in their settings. The in-game timer must be enabled in the settings, and be visible on the screen. Time to submit is what shown on the in-game timer, when the level is completed.

Any previous runs which were done without an in-game timer (whether on Mobile or other sites) are preserved and kept on the leaderboard under Mobile. BUT, runs like that won't be accepted anymore. So, if you play on Kongregate, Armor Games or coolmathgames - you can only run full-game categories.

Another rule change - the game audio is no longer required in IL runs (but is still required in full-game runs).