Any tips for "Infinite Loop" achievement?

[Major_Melon]

It's the last achievement I'm missing. I've tried several things already, and nothing seems to satisfy the criteria for this achievement. Does anyone know what is actually required for this?

What I already tried:

• Lead the donuts into a circle, e.g. like in aByZMal's 100% guide
  
• In a level with a pusher (e.g. box 7, lvl 2), build a loop, connect to the end, and make sure nothing actually reaches the end.
  
• In a level with a crossing (e.g. box 10, lvl 2), build an actual infinity figure and let donuts loop through that.
  
• Using the duplicating teleporters (box 11) doesn't help, as the exit trays are still the only way to remove donuts from the belts.

I tried each one with and without impatience mode and/or fast-forwarding, waiting a minute or two each time. Nothing worked.

Does anyone know what's going on?

[muu]

Are you getting the voice line about your donuts being stuck in a loop? If not, I'd suggest fixing whatever problem the voice tells you about (while keeping the loop) until you get that line. If you already are getting that line and still not getting the achievement, then I have no idea what the problem might be.

[Major_Melon]

Okay... I wanted to answer that I don't get any voice lines about errors in these levels.

It turns out you need to have tutorials activate in the gameplay settings to get the line. Once that was on, the achievement popped right away.