How does the Challenge/Bluff work?

[Hystorm]

Is it the total of the color you have vers the others number of cards/total for same color?

[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 ❌)

[GloopStarr12]

Scenario 1: The riskiest play for player A, if they jump in on a +4 (lets say the previous colour chosen was blue) and they have a blue then player B wins the challenge, however if player A has no blues then player B loses the challenge

Scenario 2: Player A has no other cards to play so they draw from the deck and luckily get a +4, player b always loses challenge in this scenario

Scenario 3: its dependent on if they have a DIFFERENT card they couldve played, so say A plays a +4 while theres a blue 5 on the top of the deck, player B wins if A has either a 5, a blue, or a normal wild. Player B loses if A has no other cards they couldve played other than the +4

TLDR: If player A couldve played any other card they lose the challenge, if player A has no other cards to play other than the +4 then player B loses the challenge
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Legend:
Player A: Player placing +4
Player B: Player getting +4'd
Scenario 1: Player A Jumping in on a +4
Scenario 2: Player A drawing +4 from the deck
Scenario 3: Player A playing +4 they already had