# Scenario builder

The builder is the screen where you put your bot together. The scenario is drawn on it as a scheme: blocks connected by arrows. The bot guides a person along the arrows starting from the "Start" block.

The builder opens with the "Scenario" item in the bot's menu. It is also where you start when you open a bot from the list.

## What is on the screen

- **The scheme** — blocks, the connections between them and notes. You can move it and zoom in, like a map.
- **The top toolbar** — going back to the project, block search, connecting messengers, the scheme's appearance, the "Test the bot" and "Add a block" buttons.
- **The bottom toolbar** — conversions by block, the minimap and the list of the bot's scenarios.
- **The zoom panel** on the right — zoom in and out, return to the start block, turn on box selection.
- **The "Block settings" panel** — opens on the right when you click a block.

![Builder screen: the bot scheme, the top and bottom toolbars, the zoom panel on the right](https://support.watbot.org/_media/en/01-chatbots/01-builder/_images/builder.webp?v=1791781230)

## What you need

- **No subscription is needed.** You can build scenarios and test the bot in the built-in chat without Pro. A subscription is needed once you connect a messenger and the bot starts replying to people. See the [What is available without Pro](https://support.watbot.org/billing/without-pro) page for details.
- **Access to the scenario.** The "Scenario" item is visible to the bot's owner and to team members who are allowed to edit the scenario. Team members' access is set up in the [bot settings](https://support.watbot.org/chatbots/settings).

## Saving

The builder has no "Save" button: every change is written right away. While a block is being saved, three dots are shown at its bottom instead of the ID.

> [!WARNING]
> Actions on the scheme cannot be undone. A deleted block, connection or note cannot be brought back — before deleting several blocks, the builder asks for confirmation.

## Pages in this section

- [Canvas and toolbars](https://support.watbot.org/chatbots/builder/canvas) — how to move and zoom the scheme, what each button does, selecting and copying blocks, notes, appearance.
- [Scenarios](https://support.watbot.org/chatbots/builder/scenarios) — why a bot needs several scenarios, the main scenario, folders, copying and deleting.
- [How the bot chooses a reply](https://support.watbot.org/chatbots/builder/replies) — which block the conversation starts from, how the bot processes a person's message and when it stays silent.
- [Testing the bot](https://support.watbot.org/chatbots/builder/preview) — the built-in "Bot test" chat: starting from any block, variables and tags, differences from a real contact.

How to add, connect and set up blocks is in the [Blocks](https://support.watbot.org/chatbots/blocks) section. If you are building your first bot, start with the [quick start](https://support.watbot.org/quick-start).