If I understand correctly what you're describing, it's more or less what's happening now. But it may not look like it if you're on the beginner grid, and may on

If I understand correctly what you're describing, it's more or less what's happening now. But it may not look like it if you're on the beginner grid, and may only look good/better on the larger grids (either expert size, or custom with very large size). But in short, when you uncover the first tile of this wave, at each frame I uncover only 1/60 of the total. So if you've uncovered 600 tiles, 10 should be uncovered on each frame, and it should be done in 1 second if your display is at 60FPS. But if you uncover 60 tiles only, it will uncover 1 per frame, and that can look pretty bland. Could it be what you see? If that's the case, I believe (with a good 60% certainty!) that I mostly need to revisit the method when it's for a small number of tiles.