In this game, a bird image is hidden beneath subtraction expression tiles. Players must drag and drop the correct number bubbles onto the matching tiles to solve the expressions. As each expression is solved, the bird image gradually gets revealed. The goal is to uncover the entire image by completing all the math problems correctly. Subtraction game, math game for kids, educational game, HTML5 game, kids math, number recognition, subtraction practice, puzzle game, mobile game, school activity, bird image, math skills, learning game, problem solving, number bubbles, online game