Sonic the Hedgehog (2006) was made to celebrate Sonic's 15th anniversary.
Before the Pokémon Black and White versions released there were 16 main series Pokémon games (Red, Blue, Yellow, Gold, Silver, Crystal, Ruby, Sapphire, Emerald, LeafGreen, FireRed, Diamond, Pearl, Platinum, HeartGold and SoulSilver).
19 was the name of singer/songwriter Adele's debut album.
There are 20 type specialists in the Johto based games with the 15 specific type gym leaders of Kanto and Johto and the Indigo Plateau Elite Four and Champion. Blue does not specialise in any type.
21is the minimum legal age for alcoholic beverage consumption in America.
23 is a prime number.
For counting games:
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