TL;DR

Playing Skull with the Decktet is pretty straightforward.

If you happen to have a deck of the Decktet, you can easily play Skull too:

• use the “Aces” as skulls
• use the “Kings” as point counters
• use any triple of numbered cards as roses (e.g. first player takes all twos, second player all threes, and so on).

That’s it! It even supports up to 6 players like the original game.

It’s also possible to use a regular deck of cards, although it can be challenging to go beyond 4 players (still possible but a little “abstract”).

Cheers!