| 摘要 |
A software product and a video game device for virtually performing a card game like a trading card game. Cards of the card game are given parameters each of which shows ability point or property of the card. When a player designates a first card to present it on a field (or "summon" the first card), an index parameter given to the card is compared with a threshold. If the index parameter is over the threshold, the player must "sacrifice" some cards from cards currently presented on the field in order to "summon" the first card.
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