We introduce XP and level up system where the player will gain XP by killing enemies, level up after some XP gain, and choose a new ability at each level up.
Stronger enemy kills give more XP to level up.
The ability to pick up will affect players in certain ways described below:
1- Health regeneration
2-Stamina Regeneration
3- Gun Damage
4- Knife Damage
5- Movement Speed
6- Landmines area damage size
7 - Grenade damage
8 - Extra resources Pick Up
Note: In some abilities pick up player will see level 1, level 2 upgrade(for ex: Gun damage level 1 upgrade). That upgrades and abilities are independent of each other, If you want to have maximum stats for a particular upgrade for example Knife Damage then choose level 1 knife damage + level 2 knife damage for maximum damage.