When you mine one quartz and give it to Bluey, he says he will be glad to join your party. This unlocks 2 - Player Competition Mode.
A simple stage, dotted with big dirt hills. Here are all item locations:
Quartz Crystal: One can be found in the big dirt hill in the bottom right corner. One can be found inside a random Granite. The last one can be found on top of the stony hill. (Stony hill appears at 0:30 time left.)
Pearl: A special item only in this mode. It's location is randomly generated.
Purple Pearl: It can be found somewhere inside the Stony Hill.
Super Sapphire: Use it to become powerful. It drops down from the sky on one of the hills at 0:30 time. Otherwise, if your lucky enough to have it spawn in the default map, it can be found in one of these 3 locations. The first location is inside the dirt hill at the top right corner. The second location is hidden inside bedrock in the hill on the hill on the left. The last location is inside a big glass shard somewhere on the map.
A stage for more of the intermediate players. Here are all locations of items:
Quartz Crystal: One can be found by mining the snow up beside the snowman. One can be found in the mineshaft in the cracked stone.
Pearl: It's location is randomly generated, like I said earlier.
Purple Pearl: It doesn't appear in this map.
Super Sapphire: Use it to become powerful. It drops down from the sky on one of the hills at 0:30 time. Otherwise, there is one chance to find it. You can find it in the tiny ice cave.
More stages are to be announced.
He's the hero of the game. He's automatically unlocked. His advantage(s) are: that he takes less damage from explosions, he goes quite fast. His disadvantage(s) are: his pickaxe takes a bit longer to mine than others.
Miner Man's new friend. He's also automatically unlocked. His advantage(s) are: he can't go on fire. His disadvantage(s) are: bubbles do more damage to him.
Bonuses are items that you obtain by mining Quartz Crystal. The bonuses include...
Bomb Attack: Rains weak bombs on the other player. If your foe explodes they get stunned, so try mine pearl while they're stunned!
Ultra Quake: Creates and earthquake that can stun your foe. But it still has a chance not to stun them.