You are a ZOMBIE in a CITY. It has been several weeks since the start of the infection, and you have awoken to chaos and destruction around you. The other infected roam the streets in search of the few remaining living, they shamble and run, seeking blood and meat to sustain themselves. In this, you are no different from them.

You do, however, hold within yourself the potential to grow beyond what most zombies are capable of. The MUTAGEN you possess allows you to obtain new ABILITIES or PERKS or SKILLS or whatever you want to call them. However, it only thrives in adversity. To make it strengthen you, you must perform feats of zombie domination, which is, of course, besting and devouring powerful opponents. The intial threshold is low, but your achievements must increase in difficulty nonetheless. You feel the following TASKS are to be completed for your evolution to proceed:

1 kill 1 person wielding a small melee weapon (knife or small blunt weapon)
2 kill 1 person wielding a medium melee weapon (baseball bat or other heavy blunt weapon)
3 kill 1 person wielding a powerful melee weapon (chainsaw, sword, heavy blunt weapon wrapped in barbs)
4 kill 1 person in light armour (blankets or gambeson-like)
5 kill 1 person in heavy armour (anti-stab vest or other metallic)
6 kill 1 person with a small ranged weapon (pistol)
7 kill 1 person with a medium ranged weapon (smg, rifle)
8 kill 1 person with a powerful ranged weapon (machine gun, assault rifle)
9 kill 1 person in a small vehicle
10 kill a group of 3 or more people
11 kill a group of 3 or more people with small melee weapons or more powerful
12 kill a group of 3 or more people with meduim melee weapons or more powerful
13 kill a group of 3 or more people with small ranged weapons or more powerful
14. kill a group of 3 or more people in armour
15. kill a group of 3 or more people in a small vehicle

The tasks may be completed in ANY ORDER. Once you complete a task, you gain a MUTATION. We'll talk about it in a bit. Tasks 1, 2, 3 are GROUPED. They are structured in TIERS of increasing difficulty. By completing the task of a higher difficulty, you automatically complete all the previous tasks. So if you were to straight away kill a person wielding a powerful melee weapon, it would also count as you having slain people with medium and small melee weapons. The same is true of tasks 4, 5 and 6, 7, 8 and 9, 15. Tasks 10, 11, 12, 13, and 14 are UNTIERED.

A MUTATION is a boon that the mutagen grants you. You will unlock many mutations as you go, but you cannot pick all of them. Choose carefully! Sometimes it's best to specialize, sometimes to diversify. You may at any point recombine the mutations by RETREATING into the FOREST around the CITY. You can then hibernate for as many days as many mutations are being substituted.