| Controls | |||
|---|---|---|---|
| In-Game | Menus | ||
| ←↑→↓ | Move | Z | Select |
| Shift | Focus | ↑ | Next Option |
| Z | Shoot | ↓ | Previous Option |
| X | Use Bomb | Esc | Return |
| Esc | Pause | ||
| Note: This game does not have mobile support. | |||
Unresponsive and Irresponsible Terraforming
Easy Mode
The simplest celebration and one of the best.
Normal Mode
A festival the founders would have wanted.
Hard Mode
The spectacle mankind was unworthy of.
Lunatic Mode
When the minister laughs, the party is doomed.
~ Tectonic Jubilee
| Stage | |
| Power | |
| Graze | |
| Point Items | |
| Lives | |
| Bombs | |
| Difficulty | |
| Total |
| Clear Bonus |
| High Score | 0 |
| Score | 0 |
| Next Bonus | 500 000 |
| Lives | |
| Pieces | |
| Spell Cards | |
| Pieces | |
| Power | 1.00 / 4.00 |
| Value | 10 000 |
| Graze | 0 |
| 50 fps |
| Score | |
| Stage Progress | |
| Difficulty | |
| Upgrades | |
| Virtue Gained |
--- The Capitol ---
At the end of a promenade stood two figures.
Hmm... those fireworks weren't that bad.
At least the Capitol is safe...
What was going through your mind trying to set the magmaworks off again?
In the end, Luigin was unable to persuade Lexan.
However, Annuation Mountain did not erupt anyway due to an obstruction.
I am making the decisions which are the best for this world. You of all people should understand that.
In any case the show couldn't go ahead anyway. There was a slight blockage you never warned me about...
With their ability to manipulate uncertainty, Zenryaku can observe any point in space. And yet, when a smart and wise politician makes a decision, they must always ask, 'what next?' Thus, it was inevitable that mistakes would be made.
Oh well. It doesn't matter now.
About the meteor shower soon... I am sure there is a specialist somewhere that can change a flight path or two...
Ah, you never give up, do you...
Realising that Lexan was an opponent far out of his league, Luigin retreated to the Capitol.
Lexan is too strong! Hopefully the fireworks don't cause too much damage...
It was then that Luigin's superior entered the room.
This laboratory is going to be destroyed by earthquakes if that mountain erupts!
Get back out there and go deal with it.
Try clearing the game without continues for a better ending!
| Refund All Upgrades | ||
The game is balanced not without using any upgrades.
| Category | Easy | Normal | Hard | Lunatic |
|---|---|---|---|---|
| With Upgrades | ||||
| High Score | ||||
| Max Spare Lives / Bombs | ||||
| Spell Cards Captured | ||||
| Without Upgrades | ||||
| High Score | ||||
| Max Spare Lives / Bombs | ||||
| Spell Cards Captured | ||||
Story
Today is Annuation! Every year, on this night, the Ministry of Anarchy holds a firework show for the whole Capitol.
But now is no time for jubilation. Seismographs throughout the city have been acting up all day! The source of the vibrations seems to be the Annuation Mountain, an extinct volcano visible from the Capitol's shoreline.
Armed with the power of the nearby chemistry lab, Luigin Porqui leaves to figure out what is going on there.
Basic Gameplay
This is a shooting game where you shoot the enemies and dodge the enemies' bullets.
If you get hit by an enemy bullet, you will lose a life and enemy bullets on screen will be deleted. Losing all your lives results in a game over.
If you game over, you may use a continue to respawn at max power. However, this will reset your score, lives or bombs. You may continue up to 3 times per run; otherwise, you must restart from the beginning.
However, if an enemy bullet only passes close to your hitbox, you will gain a graze point which increases the value of blue point items.
Enemy waves spawn automatically from the top of the screen in sync with the stage music.
Halfway through the stage, there is a midboss, and at the end of the stage there is a stage boss. If you defeat the stage boss, you win the game.
(There is only one stage, the Calendar Stage.)
Controls
Use the arrow keys to move.
Hold Z to shoot bullets.
Holding Shift enters focused mode, which slows down your motion, shoots your bullets in a narrower arc and makes your hitbox visible on screen as a red circle.
(Note that your hitbox only takes up about 10% of your player sprite.)
Pressing X uses a bomb, which makes you invincible for its duration and deletes enemy bullets it touches. You have a finite number of bombs, which is represented by the "Spell Card" meter on the sidebar. If you die with less than two bombs, your number of bombs will reset to two.
Bosses
Halfway through the stage, there is a midboss, and at the end of the stage there is a stage boss.
Each boss has multiple life bars; this is represented by a number to the left of the visible life bar. For example, "2" indicates that the boss has 2 more life bars in addition to the current one.
Bosses alternate between using normal attacks (shown as white sections of the boss life bar) and spell cards (shown as coloured sections of the boss life bar).
Normal attacks are incrementally stronger versions of the boss's basic attack.
Spell cards bedazzle the player with bullets crafted specifically for use in that spell card. While a spell card is active, the background will change and the
Each boss attack is also accompanied by a timer; if the timer runs out, the boss will move on to its next attack even if the life bar for the current phase has not been drained.
Bosses (Continued)
If a spell card is cleared without dying, bombing or running out of time, a large score bonus is awarded. This score bonus decreases with time taken to capture the spell.
Lexan's ninth spell card is an exception to this last point. This is a survival spell card; in other words, Lexan cannot be damaged during it, and this spell card can only be ended by reaching the end of its timer. If this is done without dying or bombing, the maximum score bonus is awarded.
While a boss is on the screen, no regular stage enemies will spawn. However, a boss may summon special enemies to accompany it during certain attacks.
Items
Defeated enemies drop items which slowly drift to the bottom of the screen. These items can be picked up by passing close to them and give a variety of helpful effects.
Going above the item autocollection line (shown at the start of the stage 75% of the way up the screen) will automatically collect every item currently on the screen. Items are also autocollected whenever a boss spawns.
Extra items are also given at certain score thresholds (shown in the game sidebar). These items' effects are automatically applied and do not need to be collected.
Below is a list of item types you will encounter playing Ordinal Project 01. (This list continues on the next page.)
 | Power Item | Adds 0.01 power and 100 score. If collected at max power, adds 10 000 score instead. |
 | Point Item | Adds score equal to the current point value; this starts at 10 000 and increases by 50 every time a bullet is grazed. |
Item List (Continued)
 | Life Piece | Collecting three of these gives an extra life. |
 | Bomb Piece | Collecting three of these gives an extra bomb. |
 | Extend | Gives an extra life. |
 | Spell Card | Gives an extra bomb. |
 | Gold Power Item | Equivalent to 100 red power items. |
| Audio Volume | |
|---|---|
| Master Volume: % |
|
| Background Music: % |
Menus: % |
| Player Sound Effects: % |
Enemy Sound Effects: % |
| This game, including the user interface, stage design and Spell Card system, is inspired by ZUN's Touhou Project franchise. The single in-game stage (Calendar Stage) is modelled after a Touhou-style Extra Stage. | |
| Ordinal Project takes its name from the OMCCDV community, which itself takes its name (but is not otherwise associated with) PatcailMemer's Ordinal Markup. | |
| Enemy & Character Art | |
|---|---|
| Luigin's sprite xis based on Jun Rhodes-Rose. | |
| Lexan's sprite is based on Ji. | |
| All other art is original. | |
| Backgrounds | |
| All backgrounds are either copyright-free stock images or original art. | |
| Music & Sound Effects | |
| Title Theme / Bad Ending Theme | Tokiko Tatsunagi - Overture of the Sprites |
| Stage Theme | Tokiko Tatsunagi - An Addendum to the Past |
| Lexan's Theme | Tokiko Tatsunagi - Augusta Iaponicorum |
| Good Ending Theme | Tokiko Tatsunagi - A Preface to the Future |
| All sound effects are sourced from official Touhou games, primarily Touhou Kishinjou ~ Double Dealing Character. | |
Version OP01.6 (2026-10-31)
- Grazing bullets while invincible now deletes them.
- It is no longer possible to lose a life after a death bomb.
- Hidden bullets during Zenryaku's first spell cards are no longer totally invisible but instead transparent.
- The duplicate Lexan during his seventh nonspell now has a 0.5 second delay before he spawns.
- Lexan's phase transition during his seventh spell card now creates yellow point items.
- Yellow bullets during Lexan's final spell no longer explode unreasonably loudly on Hard and Lunatic.
Version OP01.5 (2026-08-19)
- Bombing before a spell card will no longer fail the spell card bonus automatically if the bomb is still active when the spell card begins. Instead, if a bomb will be active for more than 2 seconds upon starting a boss attack (i.e. the time for boss invulnerability to end), extra seconds are added to the attack timer and boss invulnerability timer to make up the difference.
- Yin-yang orbs' large bullets should no longer occasionally merge with dropped items.
- The wave of red-green spirits shortly before Zenryaku no longer sometimes lingers off-screen until Zenryaku's spawn.
- Bullets which are cleared by boss transitions now turn into small yellow point items which are automatically collected and give 10 score each.
- Lexan's seventh spell card now has a phase indicator, and this health bar now sound effects for Lexan duplicating, the phase transition and the duplicate being defeated.
- Spell card bonuses now show their point value, and the tooltips linger on the screen for 1.8 seconds (from 0.8).
Version OP01.5 continued
- Using a continue with a score higher than the current high score no longer fails to update the high score.
- Sound effects no longer sometimes fail to play if this is not the first run in a session.
- Volume controls below 100% now decrease the volume 3 times more steeply.
- Collecting a bomb piece with 2 bomb pieces now plays the correct sound effect for getting a bomb (instead of an extend).
Version OP01.4a (2026-08-01)
- The good ending should no longer sometimes fail to open.
- The stage clear bonus no longer shows the graze entry as being the same as the power entry. (Internally this worked correctly so this is only a visual fix.)
- Gold power items no longer give slightly less score than intended.
Version OP01.4 (2026-07-31)
- The majority of in-game hitboxes have been shrunken by either 20% or 5 pixels from their size pre-OP01.4 (whichever is smaller), though visually they still appear the same size. This includes: the player, both bosses, all enemies except witches and all bullets.
- Grazing has been reworked - instead of every bullet having its own grazebox which is 125% of the bullet's size plus 8 pixels, the player now has a fixed grazebox extending 12 pixels from the hitbox.
- The player is no longer 41% faster when moving diagonally compared to moving orthogonally.
- The player's bullets move 125% faster.
- The player moves 12.5% faster when focused, and 12.5% slower when unfocused.
Version OP01.3 (2026-07-26)
- Added an in-game manual.
- Added character silhouettes to the main menu.
Version OP01.2 (2026-07-25)
- Enemy bullets now slowly fade into the screen on spawn.
- Relating to the previous change, stars during Lexan's sixth spell now have a 0.5s delay before they start shooting bullets, and a 0.5s delay before they stop shooting bullets and fly into the player. The end result is almost exactly the same.
- Boss hitboxes now oscillate vertically over time to match the vertical oscillation of their sprites.
- Bosses are no longer fully invincible during the first two seconds of each attack but instead have 90% damage reduction.
Version OP01.2 continued
- Flashier death animation - the player now becomes stationary for 0.4s after the death bomb window before their position resets and bullets are deleted, and a red circle is emitted during this time. The player's invincibility window after a miss is also 0.5s longer now.
- The streaming bullets from the yin-yang orbs at the very start of the stage are no longer completely stationary on Easy difficulty.
- Bullets from witches and Lexan's second spell have improved visibility.
- The second magma elemental now correctly drops a life piece rather than a bomb piece if the first was defeated.
- The player's bullets now create a louder sound upon hitting an enemy, and now have associated visual effects.
- If Lexan's fourth spell is reached for the second time in a session, the two poles no longer spawn on screen and then teleport back off screen the next minute.
Version OP01.2 continued
- The drops of Lexan's ninth spell (100 point items and a gold power item) are now spawned by the seventh shard (which is despawned during timeout) rather than above the screen.
- Added a "no continue clear bonus" which gives extra score based on collected power/point items, graze points and spare lives/bombs.
- The "Prestige" upgrade no longer prevents improving upgradeless records.
- Entering the Settings menu after playing a game no longer exits to a broken game over menu rather than the main menu.
- X can now be used to exit a menu in addition to Esc.
- Added a sound effect for getting a bomb.
- Uncapped the number of lives and bombs which may be held by the player.
Version OP01.1 (2026-07-19)
- Bullets during Lexan's second spell card now have better contrast.
- There is now a 1.5s idle period at the start of Lexan's fourth spell. To compensate, this spell card now has 1900 HP instead of 1800, and its timer is now 48 seconds instead of 45.
- It is now possible to start shooting and bombing while holding Shift.
- Luigin's sprite now turns blue while invulnerable to attacks due to recently missing or bombing.
- Added a changelog.
- Added a Settings tab featuring volume sliders.
Version OP01.0 (2026-07-19)
- Initial release - stage, bosses, upgrades, records, credits.