trading forex demo contest, and is 400%/day possible?!

I checked today the FBS contest rank on it's first day as i was participating in it ,and i was shocked to find the top ranked 10 contestants after about 12 hours of the contests have all made more than 400% profits.!!!!!!!!
The maximum leverage is 1:100 ,so probably the maximum lots to open is 10 lots ,so scientifically ,mathematically and logically ,is it possible to make 400% in 12 hours? or is something wrong?
I can't imagine it is possible ,even in my wildest dream.
Also ,i noticed that the 10 top ranked contestants are all from the same country Indonesia ,does that signify anything?
And if any FF has won more than 1 contests ,i would appreciate if he could inspire us with his view of how to approach contests trading.Thanks

Most demo trading contest is unreliable because many would find ways to slip in arbitrage trades. If you want a reliable contest results, check cashbackforex demo contest. Arbitrage is not allowed and they do a pretty good job removing the ones that do it

Thank you super trader for your answer.I'll the check the site.
I have no clue how they could arbitrage on contest platform ,but if i understand correctly,that means they are cheaters and cons ,and no one can win 400% in 12 hours.

these demo contests are often seem to be fake, i stongly feel that they are a way for the broker to lure in noobs.
somehow you never read about these demo winners making 1000s of % on their prize money.

here is a link to a 12-months long real-money competition. even though they lowered also the min. limit from 5k to 2k. and now they dont offer prizes like they used to.
http://www.worldtopinvestor.com/pub/index