Capelle aan den IJssel
When playing this game you must remember that it is not about getting rid of a card in your current turn, but about creating as many opportunities as possible for playing your remaining cards in the following turns. This implies that:
1a. you want to decrease the possibilities for adding penguins of a color of which you have got less than the average number of cards left. The extreme example of this is blocking a color of which you have no cards left.
1b. you want to increase the possibilities for adding penguins of a color of which you have got more than the average number of cards left.
2. You generally prefer to play the card of the color for which it is least likely that a spot for this color is still available in your next turn.
When selecting a card to play, you prefer to play a color that satisfies both rule 1 and 2 as much as possible. When both rules conflict, rule 1 usually takes precedence over rule 2 in the start of the game, while in the endgame it is the other way around.
As I do not want to spoil all the fun, I will leave out the details about determining which color penguin best satisfies rule 1 and 2. This is for you to find out. One clue: a pyramid has two sides.