Why this works: CrazyGames uses HTTPS and serves the game via iframe. It has no pop-unders and is whitelisted by many school filters as an “educational puzzle” domain.
The official Bad Piggies app is still available on the App Store and Google Play. It costs a small fee (or has a free version with ads) and includes all 200+ levels, plus the “Road Hogs” and “Flight in the Night” expansions.
If that is blocked, use this direct, sanitized link structure (do not click random ads):
Bad Piggies features addictive gameplay that's both challenging and rewarding. Players are presented with a series of levels, each with its own objectives and obstacles. Using a variety of materials, such as wood, metal, and rope, you'll build and design contraptions to help the pigs achieve their goals. With a focus on physics and engineering, you'll need to think creatively and strategically to overcome the challenges.
Unlike the destructive nature of Angry Birds, Bad Piggies is about construction and engineering. Classroom 6x - Bad Piggies - Google