Build modular side-view 2D river courses with seven 8-unit segments, auto-run movement, jumping, currents, hazards, moving rafts, collectibles, checkpoints, and goals.Built-in Render Pipeline only. URP and HDRP are not supported. Included controls require Input Manager (Old) or Both; Input System-only projects need a project-specific adapter. No external dependencies.River Runner Construction Kit 2D is a modular gameplay kit for building side-view 2D auto-run and river-platforming courses in Unity.Assemble a route from seven standardized 8-unit river segment prefabs. Add the included Puffy Orb raft runner, configurable currents, overlapping boost and slowdown zones, moving rafts, hazards, collectibles, checkpoints, and a conditional finish goal.INCLUDED CONTENT19 prefabs in total7 modular 8-unit course segments12 reusable runtime components3 playable demo scenes: Beginner Stream, Hazard Gauntlet, and Night Rapids1 Parts Gallery scene1 Puffy Orb raft runner prefab created for this assetCurrent and speed zonesKnockback or checkpoint-respawn hazardsElliptical looping obstaclesKinematic moving platforms and raftsCollectibles, checkpoints, a conditional goal, run timing, and UnityEvent extension pointsDamped 2D camera followEnglish and Japanese Quick Start guides, API reference, asset catalog, compatibility notes, changelog, third-party notices, and generative-AI disclosureCOURSE BUILDERThe included Course Builder is a focused Editor window. It creates or finds an active-scene course root and appends a selected segment at the next 8-unit local +X connection with Undo support. Publisher-only asset generation, demo generation, automated playtest, capture, validation, export, and Build Settings automation are not included.COMPATIBILITYVersion 1.0.1 is supported and validated with Unity 2022.3 LTS using the Built-in Render Pipeline. It was clean-import tested with Unity 2022.3.22f1. URP and HDRP support are not declared.The built-in keyboard and mouse controls require Active Input Handling to be set to Input Manager (Old) or Both. In an Input System-only project the package compiles and the built-in polling is disabled. Connect project Input Actions or UI controls to the documented public methods. No ready-made Input System actions or adapter component are included.No third-party packages are required. The package includes no telemetry, networking, Steam SDK, API keys, audio, music, inventory, persistence, pooling, or fixed scene-transition system.SCOPEMovement and current values are tunable arcade examples. This package is not a fluid, water-surface, or buoyancy simulation.ORIGINAL-GAME PROVENANCEThe reusable kit is an independent Unity 2022.3 implementation inspired by a river-running stage concept from Chihuahua Games' released title LOST IN LOST JAPAN.The original regional scene, level data, UI, characters, boat, audio, regional references, Steam features, and branding are not included as runtime or reusable toolkit content. The Puffy Orb runner, river pieces, hazards, tokens, props, prefabs, code, and demo scenes are asset-specific content.One publisher-owned PNG screenshot from LOST IN LOST JAPAN (Steam App ID 4531750) is included under Documentation/OriginalGameReference solely to document provenance. It is not loaded by the runtime, used by the prefabs or demo scenes, or represented as a product feature.The promotional video contains a short original-game reference segment. That segment is visibly labeled "REFERENCE GAMEPLAY - NOT INCLUDED IN THIS ASSET" before the video transitions to the included asset-kit content.Product version: 1.0.1Minimum supported editor: Unity 2022.3 LTSValidated editor: Unity 2022.3.22f1Render pipeline: Built-in Render Pipeline onlyURP: Not declared as supportedHDRP: Not supportedRequired third-party packages: NoneContent:19 prefabs7 modular river segment prefabs12 runtime components4 scenes: 3 playable demos and 1 Parts GalleryRuntime and Editor asmdef separationSegment convention:Entry pivot at local (0, 0)Exit direction along local +XStandard segment length: 8 Unity unitsRecommended placement grid: 0.5 Unity unitInput requirements:The included keyboard and mouse polling requires Active Input Handling = Input Manager (Old) or Both.Input System-only projects compile, but the built-in polling is disabled.Connect Input Actions or UI controls to RequestJump() and RespawnAtCheckpoint().If Auto Run is disabled, provide project-specific horizontal movement through an adapter or Rigidbody2D velocity.No ready-made Input System actions or adapter component are included.Course Builder:Appends the selected segment to an active-scene course rootUses the 8-unit local +X connection conventionSupports UndoDoes not change Build SettingsDoes not include publisher asset-generation, scene-generation, validation, capture, or export utilitiesPackage behavior and limitations:No required UGUI dependency; optional labels use Unity's built-in TextMeshNo telemetry, networking, Steam integration, API keys, music, or sound effectsNo fluid, water-surface, or buoyancy simulationNo inventory, persistence, pooling, automatic collectible respawn, or fixed scene-transition systemImporting the package does not change the active render pipeline, input configuration, active scene, or Build SettingsChihuahua Games is the author and product designer of River Runner Construction Kit 2D (CG2D-RR02). The author designed the gameplay concept, selected the commercial scope, specified the modular river workflow, determined the visual direction, reviewed revisions, tested the package, and retained final editorial and quality-control responsibility.OpenAI ChatGPT and Codex were used as implementation assistants for C# drafting and refactoring, component and API organization, documentation drafts, naming review, iteration suggestions, validation tooling, and production checks.The commercial package is a new, independent Unity 2022.3 implementation. It does not distribute the original LOST IN LOST JAPAN regional scene, level data, original boat, daruma, fisherman, bird-like character, shark, regional names, game audio, Steam integration, or fixed scene-transition code as runtime or reusable toolkit content.The package includes one publisher-owned PNG screenshot from LOST IN LOST JAPAN (Steam App ID 4531750) solely as provenance documentation. It is not loaded by the runtime or represented as reusable toolkit content or a product feature.The author-added value includes the modular 8-unit river standard, automatic runner and one-button jump system, current and speed zones, hazards, looping obstacles, moving platforms, collectibles, checkpoints, conditional goal, run manager, camera follow, reusable prefabs, demo scenes, documentation, and final validation.No AI model, online service, account, or generated response is required at runtime.
