Hassle

But... I want to play the original level with original difficulty... But the qr code is unscannable

I, also, was unable to scan the code despite many attempts from various methods.

I too mis-read the first comment and thought that the second QR code was for an easier version of the level. On closer inspection, you can see that both QR codes follow the same pattern and thus must be for the same version.

I had trouble justifying five stars after that ordeal, but it's been a few hours since I've completed it and now I can just reflect on the very intricate, clever, and rewarding design. Yes, I said "rewarding." As much as it was sooooo painful to continually restart the level, getting the bots to do what you wanted led to a certain satisfaction and a chance to reflect on each individual part of the design and the craftsmanship that went into it.

There were other subtleties as well like the green and red side split by the gray centre was nicely indicative of the different elements on each side: hidden zappers versus visible ones, regular R bot versus pillar-head R bot, and sunken railings versus a raised railing.

Spoiler: Contraption

I get a certain kick out of released mechanisms in Mekorama. Yours was special to me because I got twice the surprise from yours. I particularly liked the win block popping up in a different spot and the potential taunting to follow it along (and perhaps trigger the first one).

OK, I should probably stop there before I give anything away. I'm just imagining the work that went into this level. Very well done! Thank you for the pain!

@kayody09 - I've put another copy of the QR code under the Caption tab (you'll find that beside the Comments and Information tabs below the card image). Good luck with this level! I really enjoyed it, but it is awfully tricky.