Take a couple molds, from a few different sets, add a bunch of goop and accessories, and you get the Large Combination sets.

Varieties

These are a few examples of the Combination sets.

Example of the nicely arranged contents. Very displayable.

 Here's a couple books from the Super Thingmaker combination sets.

Notes

• Inner box is almost always cardboard.
• There are many varieties of these huge sets. Some other examples are: Boys World, Girl's World, and Triple Thingmaker.
• Some of the Combination sets each had their own variations. Example: Triple Thingmaker featured either Frightful Fun, or Fanciful Fun.