# Requirement change

The playtesters say the middle of the board is boring, so we are adding **power-up squares**.

Two of them, on the standard board: **square 7 and square 14**. Both were plain before; nothing else
about the board changes.

What a power-up square does:

- **It does not move you.** You land on it and you stay on it. It is not a snake and it is not a
  ladder, and it must not be announced as a jump — a listener watching square 7 should see the move
  and nothing else.
- **Ending a roll on it earns you another roll**, straight away, same player. A four that puts you on
  a power-up square lets you roll again exactly as a six would.
- **It stacks with nothing.** A six that ends on a power-up square earns one extra roll, not two.
- **Getting there by ladder counts.** The rule is about where you *end* the roll, so the ladder at 4
  now delivers you onto the power-up at 14 and you roll again. If you end a roll on a power-up
  square you get another go, however you arrived.
- Being sent onto one by a snake would count too, for the same reason — there just isn't a snake
  that lands on 7 or 14.

Your contract folder has an updated `SquareEffect` and a new `PowerUp` alongside it. `SquareEffect`
is still sealed, so it now permits four kinds of square rather than three; drop both files over the
ones you were given.

Everything else is untouched: the snakes, the other ladders, chaining, the six rule, the wasted
roll at the top of the board, winning by finishing exactly on the last square, and the errors.
