If you're thinking, boy UNO's sibling looks mighty familiar, well you're not wrong. The cards sport the same bright colours - and the rules are pretty similar, too. Although I - and many others - reckon they're a tad more complicated.
Instead of matching colours and numbers, you can only match numbers, although apparently matching hues gets you bonus points. Each time you get a match, you toss the pile and start a new one. There's a "hashtag" card (how very modern), which can be any number you wish, and number two cards can be any colour you want, too.
And when you've only got two cards left, you say "DOS" before anyone else.
Not feeling it and wondering why they tried to improve on perfection? You're not alone.