how challenges work?

[copacaballa [PL|ENG]]

can someone explain to me how challenging special cards work?

[prettytail]

When you do challenge against the player who play a +4 wild card to you, if they have done it despite they can play with other card except for wild card, you can force back the effect to them and make them draw 4 cards. (Challenge Successful ✅)

However, in case of they don't have any cards except for wild card which can be play, it makes you draw 2 more cards as a penalty, therefore you have to draw 6 cards in total. (Challenge Failure ❌)

[Hystorm]

Remember, If you get a +4 and then someone else drops their +4 on top of that, always challenge those! About a 80% chance you will win. Also remember, when a player is drawing cards and then drops a +4, he/she just drew it so don't challenge. If the rule Forceplay is active, never challenge as the player that dropped it, had no choice...
It's one of those things that you get a 'feel' for when playing for some time...
The best time to challenge is when the +4 is dropped as the first card for that players turn.
It's still about a 50/50 chance.

[copacaballa [PL|ENG]]

I still don't get it. :\