Physical copies of the game originally came bundled with a special pedometer called the Pokéwalker . By walking in real life, players could earn "Watts" to find items and catch rare Pokémon.
Due to its high regard and the unique Pokéwalker accessory, HeartGold has become a sought-after collector's item. Prices vary significantly based on whether the game is a loose cartridge or includes the original "Big Box" packaging. Pokemon – HeartGold
Professionally restored versions or "unlocked" copies containing all 493 Pokémon are available at sites like Retro vGames. Physical copies of the game originally came bundled