Difficulty is about 67 million, as of block 2,378,483.

You might be wondering how is this even possible. The answer is that the difficulty in testnet3 reverts to 1 after 20 minutes have passed with no one finding a block. A difficulty of 1 is so low that any CPU or GPU is capable of hitting a block. Note that this was the difficulty of Bitcoin in the beginning(2009). More details about this can be read here: https://bitcoin.stackexchange.com/questions/18554/how-can-i-find-the-real-difficulty-on-testnet