Math 24 vs Duck

Math 24 - Mental Math Cards is a classical math puzzle game. The game is designed to help people of all skill levels improve their arithmetic abilities and mental math skills. Elementary school students can also play it. But you may not solve some questions even you are a graduate student! ■ How To Play The rules are simple. Combine 4 numbers into 24 by addition(+), subtraction(-), multiplication(×) and division(÷). For example, try to use these 4 numbers: 2048 to make 24. The answer is (2+0)×(4+8)=24. The question is easy, but some questions are much more difficult. You can try this: 6 6 5 9 to make 24. ■ Stage Mode 15 stages and 300 well designed levels in total. The stages are from "Baby" to "King of Math", from easy to difficult. Touch the help button at the top-right corner if you can't solve a question. There are 3 chances to use help button in each stage. ■ Speed Mode 10 random questions! Make 24 as fast as you can! Touch the garbage can button at the top-right corner to change a question. There are 3 chances to change a question in each game. ■ Game Center "Math 24" is fully integrated with Game Center - providing both Leaderboards and Achievements. The Game Center features allow you to test your skills against the rest of the world and to share your scores and accomplishments with friends. ■ Features - Well-designed levels - Best user experience and graphics - Exciting speed mode ■ The App is suitable for you - If you like sudoku, brain training, math game or puzzle game. - If you want to play with friends or family. - If you want to improve you math skills, especially the mental math skills. Have fun!

Duck Challenge is a variation of Wythoff's Game. To win you must remove the last duck from the game board. How long will it take you to win your first game? It's fun and challenging.