Kritika: The White Knights/Gameplay

Level limits
As you level up, you unlock new features. Most features are per-character, but some are unlocked for all characters.
 * 5: Crafting items and weapons.
 * 7: Enhance (level up) items and weapons.
 * 8: Survival mode.
 * 9: Strikers and Quests.
 * 10: Gem Sockets.
 * 12: Reforge affix and Reroll value of items and weapons.
 * 13: Battle mode.
 * 17: Meteorites and Daily Dungeon.
 * 20: Inherit items and weapons.
 * 30: Pets. Unlocked for all new sub characters.

Skills

 * 3: Escape skill.
 * 7: Ex skill and hp boost passive.
 * 8: Buff skill.
 * 11: Third active skill with stun.
 * 13: MP Increase passive.
 * 14: Fourth active skill to avoid defense.
 * 17: Fifth active skill.
 * 20: Sixth active skill with stun, and DEF Increase passive.
 * 24: Seventh active skill.
 * 60: Master skills unlocked.

Stamina
Stamina, hearts, are your energy. Every stage requires 4 Stamina to be played. Later you can unlock 2x, 3x, and 4x stamina so that each time you play a level it counts as two to four times, saving you runs. This will consume 8, 12, and 16 stamina, respectively.

You get 1 stamina automatically every 3 minutes, so if you wait you will get more over time. You also get free boosts of stamina from the game a few times per day, so log in when you get the notice. If you have friends, they can send you small boosts of 3 stamina, each.

Mail
The mail system is where you get freebies from Gamevil, striker rewards, and friends' stamina gifts. The main tab of the mail system is shared between all of your characters, so if you get a bonus of 2 million gold, you can choose to give it to one of your lower leveled characters instead of your main, if you think you don't need it.

Friends
At the start of the game you can only have 5 friends. Every 5 levels you unlock 5 more friend slots, so at level 50 you can have 50 friends.

You can give friends stamina gifts once per day. Hopefully your friends send you some, too.

Friends can be used as strikers during Stage mode. If you use them as a striker, they will receive a Bronze Key as a reward in their mail. Likewise, if someone uses you as a striker, you will receive a Bronze Key.

This feature encourages the community to help one another to level up faster.