A downloadable game for Windows, macOS, and Linux

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languages: english / 日本語 / italiano


you get a mysterious letter of challenge! who could it be from...?


A LETTER OF CHALLENGE is a battle game (?) & visual novel where you play as a magical girl (with a magical guardian, of course!). you're heading home from school one day when you get a mysterious letter... find out who sent it and why!

play time is ~20 minutes.

this game was made for summer slow jams june 2020: turn-based games.

the game is free, but if you pay $3 or more, you can support me in my game-making adventures & also receive a digital art collection that includes all art from the game along with design sketches!



story/code/art by npckc
music by sdhizumi (soundtrack available here)
translation by iris3n (it)

special thanks to cloverfirefly, nanocodebug, nappa!, rachel arjache, steven hopkins, zessou, nishioka diddley, catsaveus, lilli, adept7777, aiphung, may nyan, crabby cuteness, hyukz, & lily craver!


other things i've worked on can be found here! you can comment right here or on twitter with your thoughts. 

if you like my work and want to support me, you can buy me a coffee or check out my patreon!


Download NowName your own price

Click download now to get access to the following files:

rivalgame-1.02-linux.tar.bz2 24 MB
Version 1.02
a-letter-of-challenge-osx.zip 18 MB
Version 1.02
a-letter-of-challenge-win.zip 19 MB
Version 1.02
a letter of challenge - art collection.pdf 3 MB
if you pay $3 USD or more

Development log


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I got bored and quit the game stuck in the time that she really does not need to go to...

I keep playing because it is kind of satisfying to lightning bolt the villain!

It would be simple if you could save your game, because she has 3 hearts and you have 4 moves and critical hits do a whole heart of damage; meaning killing her is numerically easy: 3 criticals kills her, 2 criticals and 2 hits kills her!

it would be nice if she responded to critical hits with OW!

After retiring, magical girl npckc tries  to make the best time-loop visual novel (???)

Jokes aside, this plot of this game feels so... 「平均」??? I don't know to react to it since it's so bizarre. It's unique in that aspect (?)

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Pretty funny and enjoyable game. Really reminds me of Madoka Magica. I made a letsplay complete with a new textbox.This game is fustrating in a good way! Although it did take me 30 minutes...

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Feelings that this game made me experience: Futile struggle against strong, ruthless, mysterious and puzzling enemy. You made that other magic girl surprisingly scary.

Pretty cute concept! Felt like this was a step up from a twist in Tavern from Tea, which I love as well! The dialogue was very charming and funny, especially between the main character and her (bee?) companion.
I made a video with my commentary and experiences. (And silly voices.) Keep up the great work! :) 

Wow nice new game! I like the magic and challenges too.

ahaha, so very cute and very, very clever! Give me big "Save the Date" vibes!

Here's a gameplay of the game I've made. Warning, contains the way to reach the ending.

I must say its a cute game to play.

Another really cute game! I love it!

I'm currently stuck on the loop just after the one where she resets time after she realizes that you know about the loop. Any hints? (It's the one where your guardian says to do nothing)

try doing nothing (:

Ah, thank you!!

this is a really cute game! it might be weird of me to ask here, but where should i contact you if i wanted to translate this game in another language?

please feel free to contact me through my website contact! https://npckc.site/#contact


nice! just want to say that as a very new fan i really think you're doing great, inspiring work! if there's any plans for a big game i would pay good money


i'd like to make a big game someday but it's just me working on these games (+ my music partner making the soundtrack) so for now it's just game jam gams for me (: 

thanks for playing!

Is... Is there an ending to this game, because, try as I might, I can't seem to progress past the loop

Is it just trial and error?

there is an ending (: at the beginning of the game, your guardian should have some hints for you as to what you should do.