There is always something that can evoke memories of our childhood such as the following hopscotch calculator although it’s just a design concept.
Hopscotch calculator is designed by Vadim Kibardin. It measures 55 x 110 x 10mm, and consists of ABS plastic frame, rubber keypad, and 8-digit LCD screen. Of course, the most unique feature is the hopscotch grid that is composed of 9 number keys. Apparently you can play hopscotch on the calculator.
At present, they are searching for manufacturers. Perhaps we can see the hopscotch calculator on the market.
Play Hopscotch on the Calculator Source