Retro Lucky Spin game

Scoring is judged on each of the 8 paylines of the 3×3 grid: the 3 rows, the 3 reels
and both diagonals. The central focal line is not the only scoring line; the scores of
all winning lines are added together.

Patterns: Basic score for three in a line
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Wild Pattern: 1,000
Number 7: 777
Diamond: 500
Star: 350
Bell: 275
Heart: 220
Spade: 180
Club: 150
Watermelon: 130
Papaya: 110
Grape: 90
Apple: 75
Orange: 60
Lemon: 50
Cherry: 40
Free: No points awarded, plus 10 free spins

Other Rules:

- Each normal spin deducts 25 Credits.

- The 8 paylines are: the top / middle / bottom rows, the left / centre / right reels,
and both diagonals.

- Scores from all winning lines are added together; one spin can win on several lines.

- Wild can substitute for any pattern except Free.

- Wild + Pattern + Wild: Score based on the pattern.

- Three Wilds: 1,000 points.

- A line that contains Free, but not three Frees, awards no points.

- Three Frees on a line add 10 free spins; awards accumulate across multiple lines.

- Free spins cost no Credits and run automatically until the count is used up.

- Free spin multipliers are 2× → 5× → 10× → 25× → 50× → 100×; the multiplier is
upgraded after a winning spin and reset to 2× after a spin that does not win.

- Landing three Frees again during free spins adds more spins and does NOT reset the
multiplier ladder.

- If a Wild appears on the middle row during a free spin, that reel stays Wild for the
remaining free spins (sticky Wild).

- Only one reel is ever held at a time. The held reel's own vertical line pays nothing,
but it still counts towards the rows and both diagonals.

- Once all free spins are over, the multiplier returns to 1 and sticky Wilds are cleared.

Win tier display:

- Single win ≥ 5,000: SUPER JACKPOT
- Single win ≥ 1,000: MEGA WIN
- Single win ≥ 250: BIG WIN
- Any other win: WIN