---
title: "Costly mistakes: cheat sheet"
subtitle: "AI robots"
---

# Costly mistakes

> The blocks from this unit. Find each one in the MakeCode toolbox (the category is at the end of each line).

:::keep-together

**change variable**: Adds to a variable's value. Change by -1 counts down. Variables.

![change variable](https://studio.learningwaypoints.com/tutorials/_pictures/makecode/change-variable.png?v=7d44ab57a8c081ee)

```makecode
count += 1
```

:::