Up Coin: Stack Challenge

Up Coin: Stack Challenge
Cosmic space themed number coin stacking merge puzzle game

How to play:
Tap to pick up colored number coins and tap again to place them on any slot, empty or stacked with different digits. Line up 10 identical number coins in one column to merge them into a single coin of the next higher value. Use the Add coins button to spawn extra coins anytime when you get stuck. Your ultimate goal is to merge all the way up to a number 10 coin to beat the level. Complete the challenge as quickly as possible to earn a higher final score.

Game features:
Shimmering purple crystal starry space background with futuristic neon UI
Glossy colorful marked coins numbered from 1 to 5 with distinct hues
Multi-column stacking slots, higher-number slots locked for progression
Convenient add coins tool to generate new coins on demand
Reset button to rearrange all coins and restart your strategy
Real-time countdown timer and live score counter at top screen
Simple tap pickup & tap placement control, easy to learn stacking logic

Arrange and stack your number coins smartly, merge matching digits step by step, craft the number 10 coin quickly and hit a top score!