2023 Brain Games, Number Search Puzzles by Addition and Subtraction Volume 1: 4,000 Questions (200 Puzzles) Hard Level, Practice you brain for Adults and Seniors or students (CCSS 3.NBT.A.2, CCSS 4.NBT.B.4)Are you ready to play the game? Welcome to the new super challenge with this amazing game, Number Search Puzzle by Addition and Subtraction! For this game, you have to solve the problem before you can find the number. Containing numbers finds puzzles covering 2,000 questions or hidden numbers,