Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!

Sum - Simple Maths Puzzle - How fast can you add two numbers?

Survey Monkey - Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.

Griddition - Griddition is a challenging numbers puzzle where you must fill a grid with numbers, Sudoku-style.

Google Forms - Simple web forms from Google.

NumberDrop - A uniquely challenging math puzzle game.