Feel free to add other suggestions for a possible implementation.

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This was suggested in the player group: boardgamearena.com/group?id=6992094

The most relevant replies:

Usagi_1071 @enmobo I agree, undo would be available until you finalize your turn. Then once you finalize, the next card would revealed and undo would no longer be an option. I don't think a request undo would impact the game's dynamic. You are more prone to errors on a screen than you are in person.

Hélie Liputien I agree about the "small screen/Big finger" problem and also think that an "undo" - as long as no card as been shown - could be a great addon !
The request tho could be a "Dynamic-issue" when you play turn-to-turn

musedreads I can't think of a reason why undo is need, as most decisions a card. Perhaps the option of "confirm" would be more helpful.

Usagi_1071 Well, if you have a confirm button, would the other be undo or redo your turn? I agree confirm or undo/redo as options at the end of your turn would be ideal.

It happens to me when i play in small screens. It would be very very helpfull to have an undo button

For me, on maybe one or two occasions I have accidentally clicked the wrong button. We have a house rule when we play the board game, that you get one "take back" per game. As accidental clicking can occur but it is very rare, maybe each player gets one undo per game? I agree however that once a card is revealed after your move this should not be undoable.

Another suggestion to prevent misclick on small screen like smartphone would be to change the layout for the buttons.
I think that use bigger square buttons on one line would help to click on the right one!

A confirm would be very useful - I have often (usually on the phone) accidentally clicked on the wrong card/option. A timed confirm button (eg like Splendor) and If I was the last player to choose, it accepts that as my move.

Spoils a great implementation otherwise.

Bump.

Yep. Just lost a game thanks to this.

Undo should be a requirement for most games when no new info is shown.

Bump.

1000000% agree. In the middle of a turn-based game now and a misclick might have costed me the game.

This still is an important issue and would greatly improve the experience of this game on this platform.

The game is incredibly easy to missclick and ruin the game for you in one move, especially when the first 2 options of constructing and building sound similar.

Wingspan does this really well, but 7 Wonders Duel does not have the option. It is so easy to accidentally click on a card before you intend to play it. An undo or confirm option would really help gameplay. We found ourselves mutually agreeing that the player should be able to undo and unable to make the game do it. Please add this feature! Thank you!

Bump to avoid automatic closure.

Lorsque je souhaite rejoindre une partie (un joueur), le bouton devient gris (au lieu de bleu) tout se bloque.. je suis donc à chaque fois en dehors des temps de démarrage d'une partie.. impossible de rejoindre un jeu. Une fois sur la page d'accueil, je peux sélectionner un jeu sans bug. Peu importe qu'il s'agisse d'un jeu Tarot, ou duel Wonder.. la situation reste la même, bloquée.

Bump to avoid automatic closure.

Bump and support confirm button.

Bump the suggestion.

Also : maybe the "cancel or confirm" option could appear right before the moment of the reveal of cards, rather than at the very end of the turn. It would be enough for the player to notice that they built a card instead of a marvel (which is, I think, the currently most annoying mistake), and that way, ANY action can be cancelled, even the ones that would reveal cards.

Related - in mobile version you have to press & hold to get information about a card icon. When the progress tokens need to be selected, press & hold vs tap to select is very easy to mistake. Having these be more distinct or having a confirm/undo would be very helpful. I accidentally selected one when I was just trying to figure out what it meant.