These flashcards are lovely and clear and cover the first 100 keywords which represents roughly half of all words we read.
The box suggests you can play games with them but does not suggest any. However, it is not hard to work out many games to play such as putting words together from the same stables such as question words: why who why where when what or place words: here there, where or similar words such as on/no, or similar sounding words such as: he, we, she, be etc...You can also use them to build up simple sentences. The important thing is to have fun and have lots of repetition.
The difference this made to my children's reading progress was incredible as they breezed through all the common words and this solid base, combined with the phonic approach, helped them decifer more complicated words by using the combined method of phonics and recognition of familiar letter patterns from key words.(eg.once you know 'all' it is easy to move on to ball call fall hall etc...)