First, a quick recap. Classroom 6x is not a game developer. It is a popular unblocked game website that hosts thousands of Flash and HTML5 games specifically designed to bypass school network filters.
Papa’s Freezeria (originally a Flash game from Flipline Studios) became a staple on Classroom 6x because it was: papas freezeria classroom 6x patched
Just because the Classroom 6x version is patched does not mean you cannot play. Here are the best, verified working alternatives: First, a quick recap
While it is tempting to hunt for "Papa's Freezeria Classroom 6x unpatched," here is the reality of those sites: Warning: This reduces your security
If you are determined to play specifically on Classroom 6x despite it being patched, there is one advanced trick: Disable your browser's security for that site only (not recommended on school computers).
Warning: This reduces your security. Only do this on trusted networks.