Most of the twisty puzzles on the market today allow you to adjust how quickly (or slowly) the faces of your puzzle actually twist. They achieve this by screwing each face of the puzzle into the core.
As you tighten the screw, the face moves closer to the core thus making it harder (slower) to turn. The same works for undoing the screw (to make it quicker and easier to turn). Now, you understand how the concept works, but you may be asking, "How do I adjust my puzzle?" Well, that all depends on what puzzle you own. Like I have mentioned before, not all twisty puzzles allow you to adjust them.
To adjust a 3x3x3 Rubik's Cube (Speed Cube Version) you simply use your nail (or any other sharp object like a tiny flat headed screwdriver) to pop off the lid on the very centre piece on any face.
Once you have popped the centre cap off, you will see a tiny screw, as I mentioned a few paragraphs ago, you need to tighten or loosen this screw to adjust how tight that specific face is. Simply repeat the process on every face. Be careful though, even half of a twist can make a big difference to how your puzzle performs.
As you loosen or tighten each face, give it a twist. Once the face is at your perfect tension simply place the cover back on the centre cap. That's it, you're done! If you want to learn how to get even faster at speed cubing head on over to our "5 ways to get quicker at speed cubing" article.