what does "suicide clip in running" mean

also what should i play on

iirc, suicide clip is a clip you can do in the second running training to get slightly out of bounds and get infinite points. However, (still iirc) it's impossible to get back in bounds and you are permanently out of bounds. Thus, the name "suicide clip". I'm not really the person to ask if you want to know how to do it, but I hope that explanation was suffice to answer your question. As to your second question, there are 2 versions that you can play this game on:

1. Flash Version. The Flash Version is used for all the categories except for "In Browser". While flash was axed from websites at the end of 2020, this game is still available via the download in the resources tab. There is also a version which is considered flash on Wix Games. Here's the link if you are interested: https://games.wixgames.co.uk/game.php?id=ducklife4
2. Unity/ In Browser Version. This version is now what is supported by most host websites including Coolmath, Math Playground, and others.

Finally, just to relate the two questions, suicide clip is only possible in the Flash Version. While I'm not too familiar with what categories use suicide clip, you cannot suicide clip in the Unity Version. This means you have to download the game from the resources tab, or play on Wix games to play that category.

To add, suicide clip is done by moving up to the left wall in the second running training, then tapping right and left right after. This allows the duck to take another step left which causes it to fall forever (unless you can RC out of the minigame).

It's allowed in any category (technically) but it's only usable in categories that make use of right click. If you accidentally do it in a No Major Glitches category you can simply close and reopen the game and to the best of my knowledge the run would still be valid.

Can you suicide clip on the first running training? I remember doing it one time and got 109 levels in one but i can't replicate it

You can, but the platforms extend past the edge of the screen sometimes (since every platform is the same width just shifted horizontally) so you can still land on them after clipping.

Theoretically, if you were to suicide clip off the map on running 1 and you managed to die later on would it count in no major glitches?

That would be fine as long as you don't use right click functions yeah.

Thanks for clarifying

Duck Life 2013 aka the Duck Life 4 remake is more broken then Flash Duck Life 4

I'd call that arguable at best since the any% category for DL4 is less than 30 seconds long :^)