I wish they did this test with people who played the Quake series (Quake / Quake II / Quake 3 / Quake Live). They were arguably one of the most popular non-realism based FPS games of their time (they spanned ~25 years).<p>The big difference between Portal is, Quake is a multiplayer game where you're playing against a human in real time and there's no backup plan of being able to Google an answer if you get stuck. You either practice and get better or get utterly destroyed. It's really a good case for overcoming challenges and persistence.<p>There's 1v1 matches where you need to memorize maps to such a degree that you can almost navigate them blind folded. You're also dealing with timing multiple items down to the second, predicting where a human opponent will go, mastering each weapon in every scenario to maximize damage output while minimizing damage input and also generally having a high level overview of how the match is going to figure out when it's worth taking risks or play it safe.<p>That's just the mental side of it too. Then there's needing very good reaction times and dexterity to aim quickly and precisely and each weapon has its own style of aiming (flick shots, precise tracking, projectile prediction, instant hit scan weapons, etc.).<p>And then there's other variants of the game like 4v4 TDM or capture the flag that share similar challenges as above but now it's amplified because you're playing with a lot of people and you need to make very interesting decisions with powerups.<p>All of this happens within seconds and becomes second nature once you've played long enough. It's actually almost unbelievable that a human brain can react so quickly and become so well adjusted to navigating a high speed virtual world under pressure. A lot of these Quake games were played at live events with hundreds of thousands of dollars on the line before e-sports became as huge as it is today.