Four Corner Detective

From BoardGameGeek:

Guess the four-digit number with your fingertips. Four Corner Detective is a new tactile card game in which players examine the cards not by sight, but with touch to decipher the four-digits. Each player is given a card, where they touch the curved corners using their fingertips. Write down their predictions and depending on their guesses aim to score the most points. Can you use your fingertips to solve the mystery?