Mad Cat (Red) Instructions - Click w to go up, a to go left, d to go right, and s to go down. If you touch Happy Cat (Blue), then you lose health but so does Happy Cat. If you touch the watermelon, you gain health. Happy Cat (Blue) Instructions - Click up arrow to go up, left arrow to go left, right arrow to go right, and down arrow to go down. If you touch Mad Cat (Red), then you lose health but so does Mad Cat. If you touch the watermelon, you gain health.