Straight answers. Every guide says whether a browser version exists, who made it, whether it is legal, and where the game can actually be bought. No links to anything that is going to vanish.
Yes. Epic released the original Unreal and Unreal Tournament for free, permanently. This one is not a grey area.
Read →The zombie mode specifically has fan-built browser versions. They are not licensed and they are not the full game.
Read →Same engine as Half-Life, same rules: open engine, files you must own.
Read →There is a legitimate open-source port of Diablo, and it needs your own game files.
Read →No. There is no browser version of GTA 5, and any site claiming one is either lying or streaming.
Read →Same story as Vice City, same rights holder, same takedowns.
Read →There is a real browser port. It has also been taken down by the rights holder before, which is the part the viral lists leave out.
Read →Technically yes, through an open-source engine port, but you have to supply the game files yourself.
Read →There is a fan project that runs it in a browser. There is also an official PC release that simply works.
Read →Yes, and this one is completely legitimate. Mojang keeps the original version online for free.
Read →Quake's engines are open source. Its levels, textures and music are not. That distinction is the whole answer.
Read →The engine is open source. The game is not.
Read →Skate 3 is an Xbox 360 and PlayStation 3 game. Browser emulation of that generation is not viable yet.
Read →A PC port exists and it runs beautifully. Nintendo has taken it down repeatedly.
Read →A fan port does run it in a browser. It requires the game files from a copy you own.
Read →The free classics page lists games that are genuinely free or open source, several of which run in a browser with nothing to install and nothing to supply.