Unlock! Mysterieuze Avonturen

Yes — the rulebook recommends playing the Tutorial first because it walks you through setup and the core mechanics, and it can be played even before reading the rulebook (p. 2, p. 7).

Any time a room card or any other card displays a number or letter, players must take the matching card from the deck (matching the number/letter on the card back) and reveal it face-up so everyone can see (p. 2).

Combine objects by adding their red and blue circle values and then reveal the card matching that sum; the golden rule is that a red number can only be combined with a blue number (no red+red or blue+blue) (p. 4).

Modifiers are blue "+n" values that never match a card in the deck and must be added to a red number (following the golden rule) instead of using the modifier as a card number itself (p. 5).

Penalty cards instruct players to follow their penalty (usually losing a few minutes) and must be discarded afterward; in the app you press the Penalty button to apply and record the time loss (p. 4, p. 7).

Codes are 4-digit numbers you enter into the app’s Code keypad to progress and wrong codes usually cost time, while hints are obtained by pressing Hint and entering the revealed card’s number (or the number below a lettered card); the app provides the responses (p. 6, p. 7).