I liked this one! Framing the problem like this makes it really obvious why switching is advantageous.

Grammatical edits:
"Win percentage" should be two words.
Capitalization and tense in the first sentence: 'based on the American TV show "Let's Make A Deal"'

The given visible tests in "Your Test Cases" generate errors, even for solutions that can be submitted successfully:

/RobotTest.java:1: error: package org.Junit does not exist
import org.Junit.Test;
^
/RobotTest.java:6: error: cannot find symbol
@Test
^
symbol: class Test
location: class RobotTest
/RobotTest.java:13: error: cannot find symbol
@Test1
^
symbol: class Test1
location: class RobotTest
3 errors