Ludum Dare 32 — April 17th-20th, 2015 — Theme: An Unconventional Weapon

chromenopePSA: As of Chrome 42 (Released April 14th), NPAPI plugins are disabled by default! That means Unity Player, Java, and Silverlight games will not work in the Chrome browser! That said, Flash in the Chrome browser continues to work fine (PPAPI).

To Developers: Consider using HTML5 and WebGL instead. Having troubles with the export? Don’t worry. See Ports below.

To Players: A workaround is to enable NPAPI plugins in your Chrome settings. Click or Copy+Paste this URL in to a tab:


As of September 2015 however, this option will no longer be available.

Other browsers (Firefox, Internet Explorer, Safari) and Flash are unaffected, but FWIW there is no Unity Player or Silverlight for Linux.X

Back to Browse Entries

The Calcannon

by igorfelga - Compo Entry

Welcome to The Calcannon

Update: Bug Fix - Numpad fix and the visual buttons (in the calc) fix too.

Save the castle and don't allow enemy collide with the wall!!!


- Type the anwser of expression (just interger);
- To erase, tap SPACE;
- Right click to prepare the cannon;
- Aim the enemy expression;
- Left click to shoot;

Downloads and Links




Celt says ...
Apr 20, 2015 @ 2:19am

This was stressfull :D
Nice idea, dude i'm bad at calculating

Apr 20, 2015 @ 1:06pm

Cool game - really demands some quick thinking and reflexes. Very cool music also, really sets the mood for the urgency of the game. Only thing is that it gets too hard too quickly. Overall a fun little game!

Ilseroth says ...
Apr 20, 2015 @ 2:35pm

Fun concept, but it ramps up crazy fast. On top of that, the game glitched and the cannon stopped working when I was playing.

May consider having the cannon auto fire when you enter in a correct answer, would fix a bit of the problem with the ramp up.

ajopart says ...
Apr 20, 2015 @ 2:39pm

Hard time to understand the gamplay (numpad isn't supported) but nice concept. Really, 29*25 ?? Well done

ViliX64 says ...
Apr 20, 2015 @ 2:40pm

This is pure evil. You can't just ask people to do math in games.
(Nice idea for unconventional weapon. I honestly did not see that comming :D )

jhell says ...
Apr 20, 2015 @ 2:49pm

Controls are broken for me :(. A nice idea though, and perfectly on theme. Cheers!

zatyka says ...
Apr 20, 2015 @ 6:39pm

Interesting concept, but I think the execution could use a little work. Things get difficult way too fast. I think it would be better if your answers auto-fired. Also, and this may be my error, I couldn't figure out how to input negative number, or numbers with decimals.

biscuitdough says ...
Apr 22, 2015 @ 6:28am

the numpad thing got me too at first.

NoWandStudios says ...
Apr 22, 2015 @ 7:54pm

Nice concept but impossible to play, number buttons wasn't where they was supposed to be.

Photon says ...
Apr 23, 2015 @ 1:58am

The firing was really unresponsive for me and as mentioned already the calculator glitched and wouldn't let me type in answers. Nice spin on the theme though.

6x13 says ...
Apr 23, 2015 @ 2:12am

I like the concept and mechanics even though it is a little unbalanced. Also it has glitches. But still, that is a good work! And I loved the music.

mildmojo says ...
Apr 23, 2015 @ 4:35am

The difficulty ramps up really quickly on this one. Entering a number and then right-clicking and left-clicking (on a trackpad!!) was kind of awkward. Plus the game didn't capture the minus key so it popped open my browser's search box and took focus away (I use typeahead find).

Sometimes two expressions would end up on top of each other, which made them really hard to read. Using non-integer fractions (even though you use an integer answer) was a mindbender.

The idea is pretty good and kudos for working on something that could be good for reinforcing arithmetic skills. It just needs a little better pacing, streamlined control, and a little polish.

You must sign in to comment.

Mini Submission FAQ

TEAMS: Teams entering the Jam should pick a single representative to submit your game, or create a team specific account you can share. We currently do not support Team Voting, but sharing an account and together playing and rating games is acceptable.

CAN I ENTER BOTH EVENTS?: You should pick 1 event, whichever you think it’ll do better in. If the idea is strong, and everything plays well enough, you can go Compo. If you’re a perfectionist, and would prefer people to play a more polished game, do the Jam. Historically, more games are entered in the Compo, but with more people and more time, Jam games have the potential to be better (that doesn’t mean they are). Many solo participants do enter the Jam.

If you made 2 games, unfortunately, the website doesn’t support multiple submissions per user. To submit your 2nd game, you will have to make a 2nd account. Only do this if you made 2 games. Alternatively, if one game is better than the other, then consider just entering the better game.

CAN I KEEP WORKING UNTIL THE DEADLINE?: Yes! Immediately after the 48 or 72 hours, we do something called Submission Hour. As the name suggests, it’s an extra hour for you to package, upload, and submit your games. If there were catastrophic issues trying submitting your game, or you misunderstood how submissions work, that’s okay. It happens. We’re flexible. If you need advice, check with the folks on IRC. If you need an admin, get in touch.

CAN I KEEP WORKING ON MY GAME?: Oh definitely! You should! But for the sake of judging, keep the Compo or Jam version around. You can include a link to the Post-Compo/Post-Jam version of your game on your games page, but sure your main links are the original version.

PORTS: Ports to other platforms can be done after the deadline. That said, the sooner you finish your port, the sooner people can play your game, improving your chances of placing in the final results. For best results, provide a Web version of your game, or a Windows version with no dependencies. Also be sure to rate at least 20 games to improve your visibility (Coolness).

MY GAME CRASHES, IS UNBEATABLE, OR I MADE A TYPO: We allow you to fix crashes, win condition, or tiny bugs after the deadline. In a sense, this is like “porting” to support more players. We leave this open to interpretation, but generally speaking your game should be identical to the game you submitted. No new features, just fixing mistakes you should have caught had you been better rested.

MY GAME DOESN’T SHOW UP: If you can’t find your game, it’s usually because the URL to your downloads are missing ‘http://‘. Fix your URLs ( and you will show up. Alternatively, if you just posted it, wait a minute. The cache may not have refreshed yet.

NOT LOGGED IN?: If you get a message about not being logged in, even though you are, it’s because your web browser cached the non-logged in page. You can fix this by either refreshing your cache or clearing your cache. CTRL+F5 in many browsers. Chrome is a bit more work. Press F12 to enable Developer Mode, then you can right click on the refresh button and select “Empty Cache and Hard Reload”. This option is unavailable if you are not in Developer Mode.

[cache: storing page]