Sum Go

SumGo is a number-combination puzzle game. On a 5x5 grid, drag and drop number blocks to fill an entire row or column. If the sum of the numbers in that row or column equals exactly 10, the line is cleared and you earn points. The game tests your spatial planning and arithmetic skills.

### Objective

Clear as many rows and columns as possible to achieve the highest score within the limited board space.

### Basic Rules

1. Board: A 5x5 grid with 25 cells in total.
2. Blocks: Each round presents 3 block sets to place. Each set may consist of 1 to 4 blocks in various shapes (single, horizontal, vertical, L-shape, 2x2 square, etc.). Each block carries a random number from 0 to 9.
3. Drag & Drop: Touch and drag a block set onto an empty area on the board, then release to place it.
4. Clearing: When all 5 cells in a row or column are filled and the sum of their numbers equals exactly 10, that row or column is cleared.
5. Game Over: The game ends when none of the 3 available block sets can be placed legally on the board.

### Scoring

- Each cleared cell: +2 points
- Clearing multiple lines (rows/columns) at once: bonus of lines cleared × 10 points
- Chain clearing is possible — after a clear, the system recursively checks for new eligible lines.

### Controls

| Action | Method |
|--------|--------|
| Select & drag blocks | Touch a block set and drag it onto the board |
| Place blocks | Release your finger over a valid empty position |
| Cancel placement | Release over an invalid area — the block set snaps back |
| Use power-up | Tap the power-up button (watch a rewarded ad) or drag blocks to the power-up zone |
| Start game | Tap "Start Game" in the lobby |
| Return to lobby | Tap the close button during gameplay |

### Power-up System

- Auto Correction: Activated by watching a rewarded video ad. The system checks each row/column on the board; if a line's sum is less than 10, it automatically adjusts the current block's number to help you reach a sum of 10.
- Drag-to-power-up Zone: Drag a block set to the power-up zone on the board to change all numbers in that set to the smallest number among them.

### Stamina System

- Initial stamina: 50 points
- Each game session consumes stamina
- Stamina can be replenished by watching ads, etc.

### Tips

- Prioritize placing high-numbered blocks — they make it easier to reach a sum of 10.
- Pay attention to the shapes of remaining blocks and plan your empty space ahead.
- Use power-ups wisely to turn the tide, but remember they are limited.
- Clearing multiple rows and columns simultaneously yields a significant bonus score.