Unlock Lui Kang's Tomb Arena
At the end of the bridge in earthrealm after fighting Jax (Area H-6).
100% success rate. 

Unlock Beetle Lair Arena
Found in a treasure chest at point A-6 in Earthrealm after finishing Konquest.

Unlock Courtyard Arena
In a treasure chest in nether realm (Area A-1).

Unlock Dead Pool
Open Koffin JI with 2191 Ruby Koins.

Unlock Dragon King Arena
In chaos realm at 4am on a Sunday check one of the huts at D-7.

Unlock Dragon Mountain Arena
In a treasure chest at point H-8 in Outworld.

Unlock Golden Desert Arena
In a treasure chest in neather realm (area E-2).

Unlock Kuatan Palace Arena
In a treasure chest at point A-4 in Orderrealm.

Unlock Living Forest Arena
Open Koffin DS with 1694 Sapphire Koins.

Unlock Nexus Arena
Treasure chest in choasrealm (Area A-4, 3am).

Unlock Portal Arena
Treasure chest in earthrealm (area G-5).

Unlock Quan Chi's Fortress Arena
Treasure chest at point H-5 in Orderrealm.

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