Hi, on the picture you see nothing. That's "normal", because all Minigames are triggered. Now some more informations about them. (You can find them in the questlog, too)
Minigame A - Ship TD: Build Tower near the water to destroy the ships. You can upgrade them, but don't forget Magic Sentry for the last round (there are 5 rounds).
Minigame B - Hunting: Each Player get a Hunter. You have to kill the enemys in the playing area. Winner is, who kills the most (there are 31 animals; but some of them are creeps) OR winner is the player, who survives.
Minigame C - Gold & Lumber: Harvest Gold + Lumber. You can also build tower to defend you or your base. Are you or your base killed you will get another base or worker later.
Minigame D - Battle for the Hill: Build buildings. They train automatically (periodly) units, who will attack the other player. You can build tower, to defend you or your base, too. Don't forget to upgrade/research. Winner is the player whose Base survives.
Minigame E - Invasion: Every Player get a hero, your aim is to survive 10 Waves. After each rounds, you'll be healed and useful items will appear. But note: Creeps will getting harder each round. You'll be revived if you die.
Minigame F - Hero Tower Wars: (Update/new) Choose between 3 heros, this hero is a building so he cannot move. Then send units to fight the enemy hero-tower/building. Every sended unit increase the income you get every 15 second. Moreover you can upgrade your units and your hero in the research center.Special abilities can be found there, too. Winner is the player whose hero survive.
