Great game but add boosters – Fitz: Match 3 Puzzle Game Review

When I match 4+, why do they disappear like matching 3? 4 in a row makes a vertical tile, 4 in a column makes a horizontal tile, a L shape makes a blast tile, a T shape makes a plus tile, and 5 in a row or column makes a rainbow tile.
Review by Ls_ga on Fitz: Match 3 Puzzle Game.