Playing from a digital or printed PDF is identical to the physical game. Here is the official rule set.
The card game (also known as Dark Stories) is a popular lateral thinking game where players solve morbid riddles using only "yes" or "no" questions. While the official game is a physical boxed set, you can find various digital resources, including PDFs and academic papers, that detail its mechanics and provide collections of riddles. Digital Resources and PDFs
Design a front (the riddle) and a back (the solution).
– A man opens a letter, reads it, then jumps out of a window. Why? Solution: It was an eviction notice from his 100th-floor apartment. He was afraid of heights but had to leave.