I would also recommend Rollbit trading game prediction.

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This will really challenge your prediction analysis skills.
And it's easier because you're just betting whether the price goes up and down.
However, there are actually a prediction contest that's been going on
https://bitcointalk.org/index.php?topic=5346118.0But with a lot of competition, you'll probably have a little chance to win it all lol.
This is a game contest in this community from a well established member,and it's too bad one of the requirements
Is you need to have atleast earned 250 merits.
-to participate you must HAVE 250 EARNED MERIT and at least 100 ACTIVITY
But you can always check this guy every now and then he usually held a prediction contest.