> Is it allowed to hit checkpoints in no items?

yes

Yes that's right, now that you say it, we think the same. We are therefore going to replace the Chicken glitch category for level 5 with the Bed glitch.
As the chicken glitch is not possible on this level, that didn't make sense either.
Thanks for reporting this.

this is AltF4 game available on Steam, https://store.steampowered.com/app/1137460/ALTF4/

AltF4

ALTF42

Since it turned out that the chicken glitch, which is mostly based on luck, was about to smash all the leaders, we decided to create separate categories on each level for those who use it in their runs. We hope you'll enjoy it.