Harry Potter and the Methods of Rationality

As Harry stepped out of the bed, he saw a piece of paper facing out from his headboard.

The paper said,

My fellow Ravenclaws,

It's been an extra long day. Please let me sleep in and don't worry about my missing breakfast. I haven't forgotten about my first class.

Yours,

Harry Potter.

And Harry stood there, frozen, ice water beginning to trickle through his veins.

The paper was in his own handwriting, in his own mechanical pencil.

And he didn't remember writing it.

And... Harry squinted at the piece of paper. And unless he was imagining it, the words "I haven't forgotten" were written in a different style, as if he was trying to tell himself something...?

Had he known he was going to be Obliviated? Had he stayed up late, committed some sort of crime or covert activity, and then... but he didn't know the Obliviate spell... had someone else... what...

A thought occurred to Harry. If he had known he was going to be Obliviated...

Still in his pyjamas, Harry ran around his bed to his trunk, pressed his thumb against the lock, pulled out his pouch, stuck in his hand and said "Note to myself."

And another piece of paper popped into his hand.

Harry took it out, staring at it. It too was in his own handwriting.

The note said:

Dear Me,

Please play the game. You can only play the game once in a lifetime. This is an irreplaceable opportunity.

Recognition code 927, I am a potato.

Yours,

You.

Harry nodded slowly. "Recognition code 927, I am a potato" was indeed the message he had worked out in advance - some years earlier, while watching TV - that only he would know. If he had to identify a duplicate of himself as being really him, or something. Just in case. Be Prepared.

Harry couldn't trust the message, there might be other spells involved. But it ruled out any simple prank. He had definitely written this and he definitely didn't remember writing it.

Staring at the paper, Harry became aware of ink showing through from the other side.

He flipped it over.

The reverse side read:

INSTRUCTIONS FOR THE GAME:

you do not know the rules of the game

you do not know the stakes of the game

you do not know the objective of the game

you do not know who controls the game

you do not know how to end the game

You start with 100 points.

Begin.

Harry stared at the "instructions". This side wasn't handwritten; the writing was perfectly regular, hence artificial. It looked as if it had been inscribed by a Quotes Quill, such as the one he'd bought to take dictation.

He had absolutely no clue what was going on.

Well... step one was to get dressed and eat. Maybe reverse the order of that. His stomach felt rather empty.

He'd missed breakfast, of course, but he was Prepared for that eventuality, having visualised it in advance. Harry put his hand into his pouch and said "Snack bars", expecting to get the box of cereal bars he'd bought before departing for Hogwarts.

What popped up did not feel like a box of cereal bars.

When Harry brought his hand into his field of vision he saw two tiny candy bars - not nearly enough for a meal - attached to a note, and the note was inscribed in the same writing as the game instructions.

The note said:

ATTEMPT FAILED: -1 POINT

CURRENT POINTS: 99

PHYSICAL STATE: STILL HUNGRY

MENTAL STATE: CONFUSED

"Gleehhhhh" Harry's mouth said without any sort of conscious intervention or decision on his part.

He stood there for around a minute.

One minute later, it still didn't make any sense and he still had absolutely no idea what was going on and his brain hadn't even begun to grasp at any hypotheses like his mental hands were encased in rubber balls and couldn't pick anything up.