Here's a brief overview of the commands and constructs at your disposal.

Commands

• DRIVE: Drive one square in the direction you're facing
• TURN RIGHT: Turns 90 degrees to the right, relative to where you're facing
• TURN LEFT: Turns 90 degrees to the left, relative to where you're facing
• PICK UP CREDIT: Pick up a credit you're currently on

Conditions

• WALL AHEAD: True if the square directly ahead of the car (keeping in mind the direction) is a wall or boundary of the grid
• ON CREDIT: True if currently on a square containing a credit
• ON FINISH: True if currently standing on the finish field

Syntax

One command per line. You can use conditionals either as one-liners or as blocks.

Conditional one-line examples:

IF WALL AHEAD: TURN RIGHT
UNLESS WALL AHEAD: DRIVE

Conditional block example:

IF WALL AHEAD:
  TURN RIGHT
  TURN RIGHT
END

Loops

Currently only conditional loops, either as one-liners or as blocks.

Loop one-line examples:

UNTIL WALL AHEAD: DRIVE
WHILE WALL AHEAD: TURN RIGHT

Loop block example:

WHILE ON CREDIT:
  PICK UP CREDIT
  DRIVE
END