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It isn't quite hard to find out one after intensive playing and Google searching. I ended up mailing the game author about the other one. Here are both of them.

1. Unlock the 8th ship

In the "Select Ship" menu, there's a question mark at the last slot. Complete the campaign in all three difficulties and a ship will appear at that place. It requires all 9 gold, silver and bronze medals to unlock, with 36 defense and 140% speed.

2. Complete the advanced tutorial

According to the game author, the tutorial will become an advanced version (called a "warm up") after completing the campaign in any difficulty. The advanced tutorial contains three stages, introducing waves of marching cubes and motherships.

It isn't quite hard to find out one after intensive playing and Google searching. I ended up mailing the game author about the other one. Here are both of them.

1. Unlock the 8th ship

In the "Select Ship" menu, there's a question mark at the last slot. Complete the campaign in all three difficulties and a ship will appear at that place. It requires all 9 gold, silver and bronze medals to unlock, with 36 defense and 140% speed.

2. Complete the advanced tutorial

According to the game author, the tutorial will become an advanced version (called a "warm up") after completing the campaign in any difficulty. The advanced tutorial contains three stages, introducing waves of marching cubes and motherships.

It isn't quite hard to find out one after intensive playing and Google searching.

In the "Select Ship" menu, there's a question mark at the last slot. Complete the campaign in all three difficulties and a ship will appear at that place. It requires all 9 gold, silver and bronze medals to unlock, with 36 defense and 140% speed.

One of the two secret achievements is "Unlock the 8th ship", which is described above.

I'm still wondering what the other one is.

It isn't quite hard to find out one after intensive playing and Google searching. I ended up mailing the game author about the other one. Here are both of them.

1. Unlock the 8th ship

In the "Select Ship" menu, there's a question mark at the last slot. Complete the campaign in all three difficulties and a ship will appear at that place. It requires all 9 gold, silver and bronze medals to unlock, with 36 defense and 140% speed.

2. Complete the advanced tutorial

According to the game author, the tutorial will become an advanced version (called a "warm up") after completing the campaign in any difficulty. The advanced tutorial contains three stages, introducing waves of marching cubes and motherships.

It isn't quite hard to find out one after intensive playing and Google searching.

In the "Select Ship" menu, there's a question mark at the last slot. Complete the campaign in all three levels and a ship will appeae at that place. It requires all 9 gold, silver and bronze medals to unlock, with 36 defense and 140% speed.

One of the two secret achievements is "Unlocked the 8th ship", which is described above.

I'm still wondering what the other one is.

It isn't quite hard to find out one after intensive playing and Google searching.

In the "Select Ship" menu, there's a question mark at the last slot. Complete the campaign in all three difficulties and a ship will appear at that place. It requires all 9 gold, silver and bronze medals to unlock, with 36 defense and 140% speed.

One of the two secret achievements is "Unlock the 8th ship", which is described above.

I'm still wondering what the other one is.