Pokémon Red and Blue/Gameplay

Main menu
The main menu does not have many features at all. Upon pressing the you'll be brought to a screen with two options: NEW GAME and OPTION. NEW GAME will start a new game and get on with things. However, you might want to visit the OPTION menu to tune things to your idea of perfection. Below is a list of the settings and information about those settings.

Moving around
Moving around is in a grid/tile style. Moving up, right, down, or left will move one space in that direction.

For more information on this topic, visit the Controls section.

Battle
The whole game is centered around Pokémon battling. Battling consists of fighting an opposing trainer with Pokémon or fighting a wild Pokémon with your Pokémon.

For more information on this topic, visit the Battle page on Bulbapedia.

Items
To access the ITEM GUI, you have to press and click on the ITEMS tab. In other generation, this is called the PACK or the BAG. None of your items are organized at all, unlike future generations. Here's a complete list of all the items in the first generation of Pokémon(note that images of items do not appear in generation one games. However, pokeball sprites do appear and they all look like this.):