Game 1: Lot of mistakes here, yet certain shapes get played that I don't think would be played between weaker opponents. I'll say 6k.
Game 2: Two kos are fought, and weaker players tend to be afraid of ko. However, there are a lot of weird moves, like 143 and 162, to name a couple. Still, the players seemed to focus on their weak groups and such. So, I'll write off the weird moves and say 2d.
Game 3: 2d. Some very intense fighting here. Some moves feel weird, so it may be a lower-ranked player, but there are other moves that I don't know a weaker player would play.
Game 4: I was going to say 6d, as the game looked pretty high level save for the missed atari. The missed atari is actually what caused me to write the game off as not being pro, as although it is entirely possible for a high-dan player to miss an atari, I did not think that a pro, who I assume has longer time controls, would miss one. However, I peeked through the hide tags and saw that this actually is a pro game. So that obviously is my answer
. Feel free to disqualify me if you want, but may I point out that there was no rule explicitly prohibiting reading others' hide tags before posting
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