Memory Card Game play online

This game is a great memory-based card game. You can play it with a regular pack of cards. The objective is to collect the most pairs of cards. On each turn, a player turns over any two cards (one at a time) and keeps them if the cards match (for instance, two kings). If they successfully match a pair they get to keep the cards, and that player gets another turn. When a player turns over two cards that do not match, those cards are turned face down again (in the same position) and it becomes the next players turn. The trick is to remember which cards are where. The person with the most pairs at the end of the game wins.
The other mode is time change game. All cards are turned face up for several seconds initially. When the game started, the cards are turned face down. Player should collect all the cards by same methods within a specified time limit.