Plus One is an addictive number game based on simple addition. You can enjoy all fun of number games, cool math games, logic games, brain teaser, and mind blowing in this free super numbers game. How to play Plus One? After game start, you will be given 4 digit number and number, which you are supposed to add to each digit (+1 or +3). You will get one point for every correct answer. But if you make mistake, you will lose point. Goal is to get the most points in 1 minute. 4 difficulty levels: Easy - add 1 Medium - add 3 Hard - add 1 or 3 Insane - add 1 or 3 with shuffled keyboard Now start training your brain, your mind and enjoy playing this free cool math, educational, and addicting mini numbers game! Challenge best score!