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tajemniczybeton: There is 521 games on gog, dice rolled 106. 106th best selling game on gog is Police Quest 1+2+3+4.
I'll say Police Quest 1+2+3+4
But you need to remember that not all games would be eligible for a gem promo. If memory serves, Mondays are classic GOG gems & Wednesday are Indie Gems. So you won't find one of the newer indie games on a monday.....