Looks like Serious Sam 2.
Yep, it must be SS2, loved the game then, although I was never able to beat the end boss.

You got it!

I managed to beat the final boss, but only because I was playing on Normal difficulty. It didn't help much that Serious Bombs were unusable in the last 1/3 of the game due to a bug. Oh, I was playing with unlimited lives as well.

gentle poke - your turn to post a pic.

Oops, I don`t have any pictures currently, why don`t you take over?

I did the previous one so it wouldn't be right. Someone else could take over.

Or you could just launch any game and take a screenshot and post it. Or hell, find one online and remove enough to make search-by-image fail. Or just find one online and post it and if someone does cheat well they can have the turn anyway.

Ok, if no-one else is standing up to the plate, here y'all go

Has that picture been edited?

Maximum Action?

Nope, it's a full gameplay screenshot.

And nope.

A few more screenshots

Edit: and 1 more for good measure.

Looks rather weird, a bit like Tron.

It's not Tron.

It's a much more recent minimalistic stealth fps with wall jumping. You have to kill all enemies before you can proceed to the next part of the level/checkpoint, and you die in one shot which makes it pretty damn difficult. Enemies die in 1 knife stab, 1 head shot or 2 body shots.

Acid Spy!

You got it! Your turn!

This is a easy one.