I have lately been playing a lot of hide and seek and there were some things that could improve in my opinion.
When the game starts and you are a hider you can see where the other hiders are going to or where they are hiding. If you are found by the seeker you can use this knowledge to find them easier. Maybe an idea that you can't see as hider where the other hiders are going to, that you can only see yourself walking.
The other thing is that if the seeker leaves the game before the game starts there will be automatically been chosen another seeker but if he is randomly chosen he won't be teleported out of the area where you can choose which block you want to be. So if there is someone else who hasn't chose which block they want to be you can instantly kill them.
When the game starts and you are a hider you can see where the other hiders are going to or where they are hiding. If you are found by the seeker you can use this knowledge to find them easier. Maybe an idea that you can't see as hider where the other hiders are going to, that you can only see yourself walking.
The other thing is that if the seeker leaves the game before the game starts there will be automatically been chosen another seeker but if he is randomly chosen he won't be teleported out of the area where you can choose which block you want to be. So if there is someone else who hasn't chose which block they want to be you can instantly kill them.