Snake and Ladder

Design a Snake and Ladder game for multiple players on a configurable board. The problem checks clean modelling of a board with jumps, a turn loop, and how you make randomness (dice) swappable and testable.

Requirements

Functional

• Board of N cells (default 100); configurable snakes (head to tail, going down) and ladders (bottom to top, going up).
• 2+ players start at position 0 and take turns rolling a die.
• Move forward by the roll; if you land on a snake head or ladder bottom, jump to its end.
• A player wins on reaching exactly N; overshooting means no move (configurable rule).
• Optional rules: rolling a 6 gives another turn, three 6s in a row forfeits the turn, multiple dice.
• Game ends when one player wins (or continues until ranking is decided, configurable).

Non-functional

• Dice must be injectable for deterministic tests.
• Rules should be extendable without rewriting the game loop.
• Board configuration validated at startup: no cycles, no jump starting at N, no two jumps on the same cell.