The Challenge
The aim of the challenge is to try to conquer Swiss and European football. This is very similar to the San Marino challenge however Liechtenstein don't have a European spot through the league. So you have to qualify through the Liechtenstein Cup and you only get to enter the Europa Conference League.
You need to win the Europa Conference League to enter the Europa League. Once you have won the Europa League, you then enter the Champions League.
Also to make this harder you have to do this back to back to back. Also what makes this more difficult is that the league is ranked lower than Italy.
Here is an example of the most successful Liechtenstein Challenge that I have ever read:
The Club Fussball Club Triesenberg is a Liechtensteiner amateur football team that plays in Triesenberg, Liechtenstein. It is one of the seven official teams in the nation. They play in the Swiss Football League in 3. Liga, which is the seventh tier. The team annually competes in the Liechtensteiner Cup. The club has never won the tournament.
Here is the club's stadium, Sportanlage Leitawies