Bingo Pongo

Bingo meets Memory!
Everyone gets a Bingo game board and markers. Then, the animal cards are placed face-down as in a standard Memory Game. When a match is turned up, the cards are not taken; instead, a marker is placed on the appropriate animal on the player's Bingo board. Then, the twist: the two cards are turned face-down again, and a monkey figure ('Pongo') is placed on one of the cards, so it is blocked for the next player(s).
As usual, three-in-a-row on a Bingo board wins the game.
There are four 'Pongos' included, and the difficulty of the game can be varied by using from one to four of them.