Play swf games in Trisquel 8

> Thanks, please clarify, running a swf game in gnash is similar to running a
> nes game ROM in a nes free software emulator?

Running a proprietary game in a free software emulator doesn't address the freedom issue either. An emulator doesn't give you the ability or legal right to modify and redistrubute the game.

I'm not quite sure but if you think about it, there is actually now way that gnash can just "forward" the execution of the swf code since then gnash itself would not be neccessary and the OS could just understand the code on its own.
So gnash has to be some kind of translater or pipe and it sure won't execute malicous code intentionally, since it is free software.
The question is rather: can it execute malicous code unintentionally, i.e. is it for gnash ok if the swf file wants to access your file system and do data manipulation.
For an emulator it sure is not since no nes rom would ever want to do that if it's a valid nes rom.
For the swf file i suspect the same but i don't know for sure.

However, this only matters if privacy is your primary goal.
Many people here have freedom as their primary goal and believe that the execution of any proprietary code, no matter if it is sandboxed or not, is not acceptable.
It's your choice.

Even if we manage to reverse-engineer the proprietary games to make them playable using free software, they are still proprietary, because their copyright holders don't re-license it under free licenses. And I don't think Gnash or free emulators, etc. can be solutions to the ultimate problem. Those free software such as emulators can be classified as "trapped free software", because they require non-free software (the dumped ROMs, for instance) to function.

Even if those proprietary games become "public domain" one day, the problem persists. This is possibly because the source code is lost way before that, or there is no hardware to support them. We call this "digital dark age".