Relax and train your brain with Number Tubes — the addictive number sorting and merging game! Tap to move balls, merge the same numbers into bigger ones, and keep going to beat your best score. No time limits, no pressure — just pure fun. Perfect for fans of merge games, number games, and classic sort puzzles. Number Tubes, number merge, puzzle game, brain-boosting, relaxing game, merge game, number sorting, kids game, 1 player, colorful, no time limit, cognitive skills, stress relief, kids friendly, puzzle, sort puzzles, numbers, merge numbers, best score