how to: + to input numbers into the grid, select the box you would like to write in, choose pen or pencil, then choose which number you would like to input. + use the pencil to note down all the possible numbers for that box, then use the pen to finalise your answer. + when all numbers have been used, the progress bar (right) will turn green for the correct solution or red for an incorrect solution. rules: + use every number from 1 to 9 once each. + equations are solved left to right and top to bottom (order of operations is ignored) + no part of any equation goes below 1 (e.g. [4]-[6]+[3]=1 is a correct equation but as 4-6=-2, this wouldn't be allowed) flaws: + some crossums may have more than one correct solution, however, the project can only accept the solution it created. + as the crossums are randomly generated, there is no filter for "easy" or "difficult". all are possible but some appear much more tricky than others. features: + highlight - when no grid boxes are selected, click a number button to see all instances of that number on the grid. + new crossum - generate a new crossum at any time. + reset - clear all progress of the current crossum to start again. + sound - (bottom left) toggle sound on or off. + mode - (bottom right) toggle between light/dark mode.
