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Below the flavortext are two main items:

• A link to a simple app in which a voice first says, “Hey everyone! Let’s play hide ‘n’ seek!” after which the solver can wander around a large, dark chamber with numbered rooms. The only things one encounters are certain weird sounds in various specific locations.
• A series of blank spaces with numbers under certain blanks.

Eventually, by traveling around and mapping the sounds, the solver will realize that the giant chamber is basically a 13x8 grid. (The START square is where the solver begins whenever they start or restart the app.) Below are locations and descriptions of all the sounds that we’d hear.

1	2	3 @	4	5	6	7	8	9	10	11 *	12	13 ^
14 *	15	16	17	18	19	20	21	22	23	24 %	25 #	26
27 +	28 -	29	30	31	32	33	34	35 >	36	37 *	38	39 *
40	41	42	43	44	45	46	47	48 *	49	50	51 ?	52 =
53 *	54	55	56	57 *	58	START	60	61	62 <	63	64	65
66	67	68	69	70 $	71	72	73	74	75	76	77 *	78
79	80	81	82 *	83	84	85	86 \	87	88	89	90	91
92	93	94	95	96	97	98	99	100	101	102	103	104

	NOISE
*	A small bell ringing
+	“I before e, except after c.”
@	“A man, a plan, a canal, Panama!”
^	Echo-y “Hello!... Hello… hello…”
-	A group of people yelling “Surprise!”
=	A clock ticking
>	A chorus singing “Alleluia!”
#	Crickets chirping in the evening
%	A hunting bugle with hounds barking
?	An officer barking marching orders
<	A car horn honking
$	A chicken clucking
\	A growl, as if from a bear

WAYS FOR THE SOLVER TO GET TO THE BIG “AHA”

• “It’s a 13 by 8 grid with 104 rooms. Is there a significance to those dimensions or to that total number?”
• “Why does that starting audio exist? Is there any significance or hidden message to it?”
• “Why is 'Romantic' capitalized in the flavortext?”
• Guessing at names for the sounds (based on the blank spaces) and googling the right ones together will definitely lead to something…

THE BIG “AHA”

• The voice at the beginning isn’t saying, “Let’s play hide ‘n’ seek.” It’s saying, “Let’s play HAYDN seek.”
• Haydn has exactly 104 numbered symphonies, many of which have formal nicknames. Thus each square must represent one of Haydn’s symphonies.
• More confirmation: Haydn’s music is from the Classical era, so technically it’s a little early to be labeled “Romantic music”.

FROM THERE…

• Each sound references a Haydn symphony by its formal nickname (“The Bear,” “The Palindrome,” “Military”, “La Chasse,” etc.). The only sound without a clear link to a nickname is the bell ringing, but since that’s also the only sound that repeats, maybe it has a different significance.

Now one can fill in the blanks with the proper symphony nicknames (the blanks will also help weed out any discrepancies in the correct names). To help with solving, the symphonies are listed in increasing numerical order:

• Le Soir
• Alleluia
• Hornsignal
• Echo
• The Palindrome
• The Schoolmaster
• La Chasse
• The Bear
• The Hen
• The Surprise
• Military
• The Clock

The numbered spaces, in order, spell out the instruction DO NUMBERLINK.

The rooms are numbered 1 through 104. Thus, each sound has two clear positions connected to it: its actual location, and the location of its corresponding symphony number’s room. However, if we naively connect the locations in traditional numberlink style, there’s no unique solution.

The solver may notice that for symphonies with shorter names, the two locations are pretty close to each other. In fact, many (ECHO, LE SOIR, etc.) are exactly as many rooms away from each other as the symphony’s word length. Are we supposed to connect the two endpoints using each symphony’s name? Totalling the letters in all the symphony names gives us 104, suggesting that yes we should do that, and that will perfectly fill up the grid.

It turns out there is only one way to make all the connections in the grid such that each line takes up exactly the same number of squares as its symphony name.

Once all the connections are made, one can then fill in the grid using the symphony nicknames. Each symphony name starts at the proper number for its symphony and then winds its way to its endpoint, where the sound was found in the grid. (The final sentence of the flavortext helps clue this direction for us.)

The only thing we haven’t yet used are the spaces that have a bell ringing. Each symphony, it turns out, has either 0 squares or 1 square with a bell in it. Below are those highlighted spaces and letters. Reading the letters in numerical order of the symphonies (as given on the puzzle page) gives us the solution, ORCHESTRA.

	NOISE	SYMPH. TITLE	SYMPH. #	TITLE LEN.	BELL
#	Crickets chirping in the evening	LE SOIR	8	6	O
>	A chorus singing “Alleluia!”	ALLELUIA	30	8
<	A car horn honking	HORNSIGNAL	31	10	R
^	Echo-y “Hello!... Hello… hello…”	ECHO	38	4	C
@	“A man, a plan, a canal, Panama!”	THE PALINDROME	47	13	H
+	“I before e, except after c.”	THE SCHOOLMASTER	55	15	E
%	A hunting bugle with hounds barking	LA CHASSE	73	8	S
\	A growl, as if from a bear	THE BEAR	82	7	T
$	A chicken clucking	THE HEN	83	6
-	A group of people yelling “Surprise!”	THE SURPRISE	94	11	R
?	An officer barking marching orders	MILITARY	100	8	A
=	A clock ticking	THE CLOCK	101	8