Alternative Rules
Solitaire
Shuffle the deck.
Flip the first two cards.
Make an invention, then set those cards to the side.
Flip the next two cards.
Make an invention, then set those cards to the side.
Repeat until you make it through the entire deck.
Rapid Fire
Set a time limit.
Shuffle the deck and pick two cards at random.
Make as many inventions as you can with the same two cards until the time is up.
(Optional) Compete with someone to see who comes up with the most inventions.
Remix
Shuffle the deck and pick two cards at random.
Imagine the objects on the cards as something other than what's obvious. For instance, the paperclip could be a strand of hair. The pencil sharpener could be a brick.
Make an invention using the reimagined objects.
Battle (1 on 1 or Team Play)
Set a time limit, the less time the better.
Look through the cards without your opponent(s) seeing.
Pick two and place them face down.
Flip them at the same time.
Your opponent(s) have to make an invention. This is why the time limit is important.
Using the same rules, your opponent(s) now take their turn to challenge you.
(Optional) Create a scoring system or include someone else to be the judge!