Game Overview
A nimble fox races across bright valleys, rocky peaks, and quiet shorelines in an adventure that trades combat-heavy spectacle for movement, atmosphere, and curiosity. William and Sly reimagines the beloved browser-game formula as an open 3D platformer, preserving its gentle fairy-tale mood while giving its landscapes more room to breathe. The central quest begins with a search for mushrooms, but a sinister enchantress and her magic gradually turn that simple errand into a broader mystery. Its tone stays cozy and contemplative even when the story brushes against darker fantasy.
Movement is the heart of the experience, with players sprinting, leaping, climbing, and navigating broad natural environments as the fox protagonist. Rather than forcing a rigid sequence of objectives, the game encourages wandering and lets players decide how thoroughly they want to investigate each area. Mushroom collecting provides a clear reason to scour corners of the map, while environmental paths, vertical terrain, and hidden locations reward confident platforming. The campaign is designed as a single-player adventure with more than ten hours of content, making it a considerably fuller journey than the short Flash games that inspire it.
What stands out most is its commitment to a peaceful, handcrafted sense of place. Built in Unreal Engine by solo developer Lucas Paakh, the game pairs stylized 3D scenery with an original fifteen-track soundtrack that supports both relaxed exploration and more urgent traversal. It feels less like a precision challenge in the vein of Super Meat Boy and more like a mellow collectathon with the roaming freedom of A Short Hike, filtered through classic web-game nostalgia. Fans of the original William and Sly games will find a familiar spirit in a much larger format, while newcomers who enjoy scenic platformers, light puzzles, and unhurried exploration should feel at home.
Screenshots
Installation
- Click the green button below to be redirected to UploadHaven.
- Wait 15 seconds, then hit “Free Download.” (Free downloads may be slower — upgrade to UploadHaven Pro for faster speeds.)
- Once downloaded, right-click the .zip file and choose “Extract to William and Sly.” (You’ll need 7-Zip for this.)
- Open the extracted folder and run the game as administrator.
- Enjoy! 🎮 If you see missing DLL errors, check the _Redist folder inside and install what’s needed.
System Requirements
- Requires a 64-bit processor and operating system
- OS *: Windows 7
- Processor: Intel Core i5
- Memory: 8 GB RAM
- Graphics: Gtx 1070
- Storage: 5 GB available space
Setup Guide & Troubleshooting
How do I fix missing DLL errors for William and Sly?
After extracting William and Sly, navigate to the _Redist or _CommonRedist folder inside the game directory and install DirectX, Vcredist, and any other dependencies included.
What should I do if the downloaded file is corrupted?
The full archive is 1.82 GB — make sure your download completed fully before extracting. Use 7-Zip to extract the files. If you still see a "file corrupted" error, re-download and try again.
Why should I run the game as administrator?
Right-click the game executable and select "Run as Administrator" to avoid save file issues and permission errors. This is especially important on the first launch.
How do I update my GPU drivers for this game?
The game won't launch — what should I try?
Try running in compatibility mode, install the latest DirectX runtime, or install the All-in-One VC Redist Package.
My antivirus is blocking the game — is it safe?
Antivirus false positives are common with pre-installed games. Temporarily pause your antivirus during extraction to prevent it from quarantining game files. You can re-enable it after the extraction completes.