Rockman Go Go!

Rockman Go Go! (록맨고고) is a mobile phone game based on Mega Man Powered Up developed by Jenoi and released in South Korea on January 5, 2015.

Challenges
Besides completing the mission, each stage has four optional objectives that gives bonuses the first time they are completed:
 * Complete the stage under a certain time
 * Defeat a certain amount of enemies
 * Collect a certain amount of coins
 * Complete with a high amount of life (above 90%) or full life

The game also has optional Quests (퀘스트) that rewards players that complete them:

Cards
Cards (카드) can be equipped to improve the stats of the characters and allow them to use one ability in each mission. The stats shown here are for cards at Level 1, as their stats, effect power and duration increase with each level. Each equipped (장착) card gains experience points after completing a stage. Once a card reaches 100% experience, its level can be enhanced (강화) by sacrificing another card and R Coins. However, if the card sacrificed is of a rarity lower than the card being leveled up, the chance of success is halved for each star. For example, improving a 3 stars with a 1 star card has a 25% of success. Success or failure, the card being used to level up the other will be lost, but R Coins aren't lost in failures.

The player has a limit of 30 cards, so undesired cards can also be sold (팔기) for R Coins or combined (조합) with other card to increase its experience points. Below are some of the cards available in the game.