A practical collection of 60 browser-based tools for creating and previewing sprite animation, cutting tilesets, converting pixel art, building tilemaps, procedural levels and worlds, balancing combat and progression, generating content, and exporting reusable game-project data.
CrazyGamesUp Game Developer Tools are 60 browser-based utilities for preparing 2D game art and animation, building levels and worlds, balancing combat, progression and economies, generating game content, testing save data, and planning game systems. They provide practical images, calculations, charts, tables, JSON, and reusable project data.
Yes. Every game development tool listed on this page is available to use online for free.
No. The tools run directly in a modern web browser and do not require an account, API key, game engine plugin, or separate desktop installation.
The sprite, image, map, and data utilities are designed to process source files locally in the browser. Your artwork or project data does not need to be uploaded to a remote generator to produce the result.
The tools produce common or engine-neutral outputs such as PNG, JSON, CSV, CSS, TXT, and ZIP. These can be adapted for Unity, Godot, GameMaker, Construct, Phaser, Defold, custom HTML5 engines, and other development pipelines.
Yes. Sprite Sheet Generator combines individual frames into a sheet, while Sprite Sheet Cutter separates an existing sheet into downloadable animation frames.
Yes. Tilemap JSON Generator creates structured, engine-neutral map data with dimensions, tile size, layers, and tile arrays. You can adapt the exported JSON to the schema required by your engine.
The combat collection covers damage, DPS, critical hits, attack speed, armor reduction, damage over time, attack range, knockback, character stats, and enemy stats. Each calculator exposes its inputs and intermediate values so formulas are easier to compare and tune.
Yes. XP Calculator measures progress toward target levels, Level Progression Calculator compares per-level and cumulative requirements, and Game XP Curve Generator adds a visual chart for inspecting linear, exponential, polynomial, and custom progression models.
Loot Drop Chance Calculator analyzes the probability of obtaining an item across repeated attempts. Game Loot Table Generator creates editable weighted entries, calculates each item probability, runs seeded simulations, and exports the finished loot table as JSON.
It creates realistic JSON test data containing player details, levels, experience, currencies, inventory, quests, checkpoints, settings, timestamps, and optional checksums. This helps developers test loading, migration, validation, and debugging workflows without preparing every save file manually.
The content generators can create items, quests, branching NPC dialogue, complete enemy profiles, weapons, armor, and potions. Their configurable and seeded results are useful for prototypes, design inspiration, mock databases, and balancing experiments.
The collection includes platformer, roguelike, cave, overworld, biome, world-seed, dungeon, tilemap, and 2D map generators. These tools produce visual previews and structured project data for different level-design workflows.
Yes. Spawn Point Generator creates separated team-ready coordinates, Checkpoint Generator plans recovery pacing, Pathfinding Grid Generator solves navigation with A*, and Wave Generator builds budget-based enemy schedules for tower-defense and survival games.
Health Regeneration Calculator and Mana Regeneration Calculator simulate recovery timelines and resource sustainability. Movement Speed Calculator combines buffs, slows, terrain, sprinting, speed caps, distance, and travel time.
Game Economy Calculator models population-wide currency sources, sinks, supply changes, affordability, and inflation risk. Currency Conversion Calculator converts between currencies using explicit base rates, fees, reverse rates, and rounding rules.
Animation Frame Generator creates transformed frames from one sprite, Sprite Animation Previewer plays a sequence of uploaded images, Sprite Sheet Animator reads frames from an existing sheet, and Pixel Art Animation Previewer adds integer zoom, onion skin, and a pixel grid for pixel-art workflows.
Tilemap Previewer combines CSV or JSON map data with a tileset to validate and render a complete map. Tileset Cutter separates the source tileset into named PNG tiles and exports them together with reusable metadata.
Pixel Art Sprite Resizer preserves hard pixel edges while scaling, Pixel Art Palette Converter remaps colors to a selected palette, Pixel Art Dithering Tool creates controlled color patterns, and Pixel Art Mirror Tool flips or combines sprites symmetrically.
They provide useful prototypes and transparent starting values, but final content should still be reviewed through playtesting, encounter analysis, visual editing, performance checks, and the design goals of your specific game.
Yes. The pages are responsive and work in modern mobile browsers, although detailed sprite, pixel-art, tilemap, and dungeon editing is generally more comfortable on a larger screen.