
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
- Select the Download button at the top of this page to open UploadHaven.
- On UploadHaven, wait for any countdown, then select Free Download. Optional: UploadHaven Pro for faster downloads.
- When complete, extract the archive to a William and Sly folder using 7-Zip.
- Open the extracted folder and start the game normally.
- For errors, check Setup Guide & Troubleshooting below. Keep your security software enabled.
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.
Do I need to run the game as administrator?
Usually, no. Start the game normally from the extracted folder. If you see a permissions or save error, check that the folder is writable and follow the game's documented fix. Only grant administrator access when a trusted game's specific setup requires it.
How do I update my GPU drivers for this game?
The game won't launch — what should I try?
Check that extraction completed and your PC meets the system requirements. Note any error message before choosing a fix. If it identifies a missing runtime, install the required DirectX components or Microsoft Visual C++ Redistributable from Microsoft.
My antivirus is blocking the game — is it safe?
A warning needs to be investigated; the download source alone cannot confirm that a file is safe. Keep your security software enabled and review the detection details. Do not run or restore a flagged file unless you have verified that it is a false positive. If you are unsure, leave it quarantined.