- You may add a deck of UNO to a deck of II and play II, but you may not add a deck of II to a deck of UNO and Play UNO. The rules for adding Mattel's UNO to II are below.
- Unlike UNO, you may play II by yourself!
- II uses symbols, as well as colors on the cards so that people who are colorblind can easily play! :) Red: Mandala, Yellow: Alien, Green: Plant, Blue: Mushroom