It's tough to pick just one. I'll start with some honorable mentions.
1. Every Xenoblade Chronicles game on Switch. We have two new games with DLC, a remake of the first game with new content, and a remaster of X coming out in 2025.
2. Every mainline Pikmin game on Switch.
3. A Smash game with such a huge roster.
The biggest surprise for me is
Three Mario RPGs on Switch all released within a year. Two remakes of beloved games and a new one as well. Before Switch launched, the interviews about Color Splash and the recent Mario & Luigi games made things seem very dire indeed.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima