A type of Verbal Arithmetic puzzle in which a set of words is written down in the form of a long addition sum or some other mathematical problem. The object is to replace the letters of the alphabet with decimal digits to make a valid arithmetic sum. Every different letter, corresponds to a different digit. The left-most digits cannot be zeroes. Solving a cryptarithm involves a mix of deductions and tests of possibilities. The puzzle to be solved is on the left. The lists of possibilities are on the right. Clicking on a possibility once, marks it with a slash. Use this state to mark it as a possibility ruled-out. Clicking a second time, removes the slash and circles the digit. This means you have chosen the digit as the correct substitution (clicking again removes selection). Currently 13 puzzles.
Credits: Puzzle 1 and some of the description taken from the Wikipedia article on "Verbal Arithmetic". (puzzle 1 source unknown) Puzzles 2-13 taken from the site: puzzles-to-print.com. (created by Kim White Steel) Thanks to @gregatku for valuable feedback.
