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Hello @ellielee I have lost count of the times I have made a move and then immediately notice that I could have created a colour bomb instead, so I agree that an undo booster would be very helpful.
Unfortunately your idea has been suggested several times already and duplicate ideas are generally not allowed.
Because there is already an active idea asking for an undo booster you would be much better off adding your vote to that idea rather than starting your own.
Here is a link to the active idea