http://www.kidsmathgamesonline.com/boardgames/checkers.html
http://www.kidsmathgamesonline.com/sudoku/easysudoku.html
https://www.twoplayergames.org/play/910-Tic_Tac_Toe_Neon.html
https://www.twoplayergames.org/play/845-Tic_Tac_Toe_Paper_Note.html
https://www.education.com/games/preschool/
http://www.abcya.com/kindergarten_computers.htm