I've been playing Infected a lot today, and I find it annoying that I have no idea what I'm buying before I rank up. I also saw several new players not quite understanding how to play the game. So I thought, why not make a tutorial?

This could be a written book that is given to all players in the lobby (and in the 30 seconds prior to the game starting). It could also be given to players with a certain command (i.e. /tutorial) so if they're in a game they can still continue to read. It could include the following sections:
[SPOILER="Sections"]

Basic Rules Explanation- The opening pages that would explain the general concept of the game
- All players have 30 seconds to hide, then when the game starts players are randomly chosen to be mother zombies, and the zombies try to infect the humans by killing them before the experience bar timer runs out
- Humans get 2 coins for killing a zombie, and zombies get a range of coins for killing humans
- If any human(s) survives the timer, all remaining humans get 200 coins; otherwise, every player besides the last human killed gets 60 coins
Shop Explanation- The next pages that would explain what each item is in the shop
- Coins that are earned in the game can be used to buy certain benefits in the shop to help you do better in Infected
- The red wool is what can be used to rank up; you start at level 0, and can progressively purchase upgrades with coins earned to get better human kits (see Human Kits Explanation)
- The grenades can be purchased for a variety of coins and can be used to affect the opposing team negatively (see Grenades Explanation)
- The mystery chest can be bought in order to have a chance to receive grenades or even 1000 coins, but it's very risky and may make you lose all your coins
- The prestige shop (Gold Ingot) can turn in prestige tokens for extremely good items, but it will take a while to get one (see Prestige Explanation)
Human Kits Explanation- The next pages that would explain what the kits are for humans, as well as show what each kit gets and how much they cost to unlock
- The players that are not chosen to be mother zombies after the initial 30 seconds will be given their human kits; these kits will improve the more you rank up in the shop
- Kits would be shown with the level of each kit, how much it costs to rank up to it from the previous level, and what it gets
Infected Kits Explanation- The next pages that would explain what the kits are for the infected, as well as show what each kit gets and how much they cost to unlock
- The players that are infected can access their kits by using /kit; there are a variety of kits that need to be unlocked, besides the default zombie kit (or zombie pigman kit), that have a variety of uses
- Kits would be shown with the name of the kit, how much it costs, what it is disguised as, and what it gets
Grenades Explanation- The next pages that would explain what each grenade does and how much they cost in the shop
- Grenades can be purchased in the shop; if they are, they will have a [Purchased] tag and will be kept until you use them, but they are a one-time use
- Grenades can also be included in a kit (both human and infected), and will be given to you every time you receive that kit
- Grenades would be shown with the name of the grenade, what it does, and how much it costs in the shop
Chat Explanation- The next pages that would explain what the numbers next to a player's name mean as well as the player list
- The numbers next to a player's name are [Coins][Rank][Player Name]
- If a player has unlocked prestige at least once, he/she will have a * to the left of their name
- The player list shows the names of all the humans left alive in the game
Prestige Explanation- The next pages that would explain what prestige is as well as the prestige shop/tokens
- Prestige costs 5000 coins and can be unlocked after level 20 in order to get a prestige token
- Prestige tokens can be used in the prestige shop to unlock various human kit items
- Prestige shop would be explained with each item it has and how many prestige tokens they cost

[/SPOILER]
Anyways, those are just some sections that I think would be good. I think it would be useful to have a tutorial book so if there's something you're not sure about for the game, you can always find it.

Also, put the "Player has been infected by Player" in the chat. It's annoying that it only shows when the infected players die in chat.

Thanks for reading! Please leave a comment on what you think! :D (Sorry if there are some grammatical errors, I was in a hurry to write this)