1## Purpose2Document the shipped Takuzu+ built-in game behavior.34## Requirements56### Requirement: Registry Metadata7Takuzu+ SHALL be registered as a built-in game with canonical description "Fill the grid with filled and empty using some relational clues. No 3 in a row.", aliases `takuzu plus, binario+, binario plus`, variants `Takuzu+ (default 1600 Elo)`, and daily legacy modes `medium, tricky`.89#### Scenario: Resolve Takuzu+10- **WHEN** the registry resolves the canonical name or any alias11- **THEN** it returns the Takuzu+ entry with help text, import behavior, variant metadata, and legacy mode compatibility1213### Requirement: Variant Elo Creation14Takuzu+ MUST support the current variant plus target Elo creation path, using the variant default Elo when no explicit target is supplied.1516#### Scenario: Spawn Takuzu+ by Elo17- **WHEN** the user selects the Takuzu+ variant and a target Elo from 0 through 300018- **THEN** PuzzleTea spawns a deterministic Takuzu+ puzzle and records target, actual, and confidence metadata when generation reports it1920### Requirement: Legacy Mode Compatibility21Takuzu+ SHALL preserve legacy named modes as compatibility presets that map to the Takuzu+ variant and preset Elo values: Beginner (300 Elo), Easy (700 Elo), Medium (1100 Elo), Tricky (1600 Elo), Hard (2100 Elo), Very Hard (2500 Elo), Extreme (2900 Elo).2223#### Scenario: Use legacy mode title24- **WHEN** the user supplies a legacy Takuzu+ mode title through CLI or deterministic daily metadata25- **THEN** PuzzleTea resolves it to the Takuzu+ variant and the registered preset Elo2627### Requirement: Puzzle Rules28The Takuzu+ runtime MUST enforce Takuzu rules plus relation clues, where equals clues require adjacent cells to match and x clues require adjacent cells to differ.2930#### Scenario: Check solved state31- **WHEN** the player fills the board or word state32- **THEN** Takuzu+ reports solved only when all rule constraints are satisfied3334### Requirement: Save Load And Interaction35Takuzu+ SHALL serialize enough state for resume/import, reset to its initial puzzle, expose debug and full-help data, and support its shipped interaction model. Keyboard symbol entry is required, and mouse click-to-focus support MUST be available.3637#### Scenario: Resume saved Takuzu+38- **WHEN** a saved Takuzu+ payload is imported39- **THEN** the restored game preserves givens, player entries, cursor/selection state where applicable, and solved-state behavior4041### Requirement: Print Export Support42The Takuzu+ print adapter SHALL render puzzle and solution data for JSONL-to-PDF workflows.4344#### Scenario: Export Takuzu+45- **WHEN** Takuzu+ is included in a JSONL or PDF export flow46- **THEN** PuzzleTea follows the registered print support behavior for that game