three sets of tiles that can be played with, the Original Tile Set includes whole numbers, fractions and four basic operations; the Junior Tile Set includes whole numbers with more 0s and 1s than the Original Tile Set, fractions with denominator 2, and the four basic operations with more addition and subtraction tiles than multiplication and division tiles, and finally the Advanced Tile Set includes negative and positive integers, integer exponents, fractions and the four basic operations. In all three sets there are equal symbols. Gosum, or Equable Gosum is similar to Numble. Users place sequences of numbers and equations, using the four main arithmetic operators (addition, subtraction, division, multiplication) and the equal sign in a Scrabble-like placement. A similar Scrabble-like arithmetic game was published in Australia, during the 1970s, under the name Equable. Number tiles were white, arithmetic operations and symbol tiles (including decimal point, fraction-dashes, and percentage) were grey, and players could freely take special equal-sign tiles when they made their move. Clearly the name was meant to evoke the conceptual link with Scrabble. The game-board also had bonus-squares. Numble One of the earlier number-based variants, Numble was a physical board game using numbers and basic mathematic equations (addition, subtraction, multiplication, division). Players form valid equations. Triolet Triolet uses pairs or triplets of numbers that sum up to less than, or exactly 15, respectively. The placement of the pairs or triplets is similar to Scrabble. Triolet means "triplet" in French. Yushino Yushino uses number sequences where every number is the last digit of the sum of the previous two. For two number sequences it requires that the numbers are adjacent. Mixmath Mixmath, a game developed by Wrebbit, also involves placing correct mathematical equations on a board with bonus squares similar to a scrabble board. Related games Bananagrams Bananagrams is a commercial version of the variant Take Two. Players draw tiles and assemble arrangements of words without a board. UpWords Scrabble Upwords (originally just named UpWords) is played with 100 letter tiles on a special 10×10 board with no premium squares (originally 64 tiles on an 8×8 board). It has a Qu tile instead of Q and a different tile distribution than Scrabble. Words can be formed as in Scrabble as well as by playing on top of previously formed words. When playing over a word, at least one tile from the original word must be incorporated into the