The two conditions for when a contest ends

(1) reached the contest end day.
(2) All the contest prizes are taken.
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A player should be charged for the number of cards he can turn
instead of the number of pairs of cards he can turn because
the number of cards he turn to win could be odd instaed of even.


http://www.makemymatchcards.com/Johns-Summer-Party-2022

extensibly 
you can decide to display/hide various pieces of information about your contest such as

totally raized amount,
title
unused turns
# of prizes left 

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OK, here is the estimate for the new project.

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Price: $1050
Time to complete: 2 months
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The things I'll keep in my mind for this project:

- Should be mobile friendly.
- Customizable game page, meaning that contest owners can decide which information will be displayed in the game page (e.g title, total raized, # of prizes left, etc ), which hopefully expands it's application beyond fundraising. 
- This is a game script so it should have some fun CSS animations like moving and flipping cards.
- It should have good logging so that contest owners can answer well in case of disputes.

Notes:

- The admin panel will resemble that of Pick-A-Box contest in terms of feature.
- Since I no longer rely on jQuery and Bootstrap, the script will load faster.