Geppy-X Guide: All Endings, Forms, and Extra Modes

The most important decision in 70s-style Robot Anime Geppy-X happens at the end of Stage 4. The form that lands the boss’s final hit determines which pilot is lost, which replacement pilot joins for the second half, and which ending remains available. Protect a save state before that final blow. Without it, a completion run can turn into three full campaign replays before the six extra modes and Beast Library cleanup even begin.

Lock in the Stage 4 branch before chasing anything else#

The current achievement list makes the branch visible: there is a separate achievement for defeating the Stage 4 boss with Unit-X1, Unit-X2, and Unit-X3, followed by three different ending achievements. A preserved checkpoint lets you change only the decisive hit instead of relearning Stages 1-4 each time.

1. Play through Stage 4 until the final boss is close to defeat.
2. Pause before committing the last charged attack or special.
3. Create a save state. If the interface offers multiple slots, keep this branch point separate from ordinary recovery saves.
4. Choose the required form and make sure that form deals the final damage.
5. After the result scene, check the new pilot and the unlocked Stage 4 achievement before continuing.
6. Finish that route once. Then test whether the game retains completed achievements, Library entries, and unlocked modes when the Stage 4 state is restored. If it does not, use a normal replay rather than assuming the state is a permanent completion shortcut.

Stage 4 final-hit form	Immediate achievement	Second-half pilot	Ending achievement
Unit-X1	So Long, Kei!	Kyou	So Long, Dear Yuko
Unit-X2	So Long, Jin!	Suzu	Flying Beyond the Sunset
Unit-X3	So Long, Riki!	Romi	So Long, Geppy-XX

This pairing comes from a detailed PlayStation-era route and is consistent with the six branch and ending descriptions in the 2026 achievement list. The remaster has only just launched, so use the roster shown after Stage 4 as the final confirmation before spending another four stages on a route.

Switch forms to answer the screen in front of you#

Geppy-X does not ask you to choose one permanent character. It asks you to change the order of the three craft during a stage. Each form has a normal main weapon, a normal sub weapon, charged versions of both, and an X-Power attack. The current publisher description gives each form a clear role:

Form	Official role	Use it when	Leave it when
X1	Balanced precision	You are learning a wave, need reliable ranged damage, or cannot yet predict where a boss will move.	A wide pattern is trapping the large hitbox or enemies need to be removed across the whole screen.
X2	Speed and high mobility	You need room quickly, the stage favors movement, or a charged X Seeker can erase scattered threats.	The target offers a long, safe damage window and a heavier attack would end the phase sooner.
X3	High-risk power	The enemy is close, its pattern leaves a safe pocket, or X Slap and X Cannon can convert a short opening into major damage.	You are chasing a fast target or the boss is filling the near side of the screen with contact danger.

Do not wait for a crisis to learn the switch. In Stage 1, practice changing from X1 to X2 and X3 while bullets are still readable. Older route references and current player reports both describe a brief defensive window during transformation. Treat it as a timing tool to test, not unlimited armor: rewind one mistake, watch exactly when contact stops hurting you, and learn that window in the current build.

Also separate rapid fire from charging. The remaster can fire the main and sub weapons by holding the rapid-fire inputs, while charged attacks still need their own deliberate timing. On a safe early wave, confirm which binding preserves the charge you expect. A convenience setting should not quietly remove the attack you planned to use on the boss.

Eight stage checkpoints, not a false room-by-room walkthrough#

The readable historical guide and a separate long retrospective organize the main campaign as eight stages, while the current achievements confirm progression through Stages 1-7 and then one of three endings. One thin community page instead says there are nine “actual stages” without listing them or explaining what it counts. This guide uses eight numbered story checkpoints and treats the extra scenarios separately; if the live Stage Select labels content differently, follow the current menu. The remaster preserves the original game inside a modern wrapper, but it also adds new controls and recovery tools. The safest route is therefore a checkpoint guide: know what the stage is testing, protect the branch, and use the live attack names and manual instead of forcing 2001 button labels onto every platform.

Stages 1-3: learn the forms and collect different finishers

• Stage 1: use the opening city battle to test normal fire, sub weapons, charging, direction changes, transformation timing, and X-Power. The clear unlocks Geppy-X, to the Rescue!. A first clear is more valuable than a perfect-looking boss finish.
• Stage 2: the route moves to the sea and underwater sections. A historical walkthrough favors X2 against the pursuing threat and identifies an X2 finish on the later shark boss as a distinct movie trigger. If the Beast Library still shows a nearby gap after the clear, repeat that boss with X2 rather than replaying unrelated stages.
• Stage 3: the old route notes different finisher scenes for X1 on the earlier boss and X3 on the later mammoth boss. These are useful Library leads, not a claim that two finishers alone complete the stage’s entries.

Stage 4: damage freely, choose the final hit deliberately

The stage spends much of its first half on a large warship before the decisive boss encounter. Destroying components can open the route and expose recovery, but none of that replaces the branch checkpoint. Reduce the final boss with whichever form keeps the attempt stable, stop before the last chunk of health, then switch to X1, X2, or X3 for the achievement and route you want.

Stages 5-7: relearn the upgraded machine

• Stage 5: Geppy-X becomes Geppy-XX during the story. Do not assume that an attack with a familiar position has the same reach or tracking. Spend the first safe waves testing Fire, Thunder, and Tornado before relying on a remembered X1/X2/X3 habit. The clear unlocks Geppy-X, Back From the Dead!!.
• Stage 6: the route includes a train-shaped boss and a fake Geppy that changes forms as its health drops. The old guide records Tornado for the train finisher and Thunder for the fake Geppy finisher. Watch the fake’s current form, preserve movement space, and do not dump X-Power into a transition you cannot damage.
• Stage 7: the late boss is described as taking meaningful damage at the head and chest rather than across the whole sprite. Aim before charging. The historical special-movie note points to Geppy-XX Fire. Clearing the stage unlocks The Dread Cosmic Demon Cannon!.

Final stage: recognize the scripted barrier

The PlayStation route describes the first phase of the final enemy as invulnerable until Atlanger breaks the anti-beam layer. If attacks produce no damage, do not burn every resource trying to overpower a script. Survive, keep space from the body, and wait for the ally event. Later phases can still fire while turning, so moving behind the boss is not automatically safe. This is one of the clearest places to create a recovery state before the phase rather than rewinding through a long animation every time.

Watch the original route without mistaking it for the remaster UI#

This no-commentary video was independently verified through YouTube metadata as PSX Longplay [122] 70s Robot Anime – Geppy X – The Super Boosted Armor by World of Longplays. It shows the original PlayStation campaign rather than the 2026 remaster interface, so use it to recognize stage order, boss phases, and story timing. Use the remaster’s digital manual and live menus for controls, save-state behavior, subtitles, achievements, and extra-mode unlocks.

Plan the three endings as one campaign plus two branch tests#

A sensible first route uses X1 for the Stage 4 finish. It is the balanced form, so the run teaches the second half without adding an awkward power or movement constraint to the branch decision. Use X2 next, when the stages and boss lanes are familiar. Save X3 for the last branch, when you can safely arrange the final hit at close range.

After each ending, record four things before loading anything:

• the Stage 4 form achievement unlocked;
• the expected second-half pilot appeared;
• the corresponding ending achievement unlocked;
• the Extra Mode menu or Beast Library gained anything new.

If a restored Stage 4 state removes later unlocks, stop using it as the master file. The remaster advertises both save states and Steam Cloud, but that does not prove that every meta-progression flag survives a state rollback on every platform. A normal stage save or fresh replay is slower but safer than discovering after the third ending that one Library state replaced another.

The six extra modes are the second half of the achievement route#

Bliss Brain confirms six unlockable modes, and the current achievement list names all six clears. The official material does not publish a current unlock sequence. Complete an ending, return to the Extra Mode menu, and play what actually opened; do not assume that a legacy title-screen code is still required.

Mode	Achievement	Practical preparation
THE MOVIE	THE MOVIE	Treat it as the advertised movie-style boss rush. Learn one safe response per boss and preserve health between fights instead of chasing a fast clear.
Fusion Robot ATLANGER	ATLANGER	Recheck the live manual because the unit does not share Geppy-X’s three-form plan. Use its durability to learn the scenario, but do not confuse durability with invulnerability.
B-Class Robot Wars R-64	Type-64 Robo	Historical references describe the early R-64 as the weak, slow challenge unit before an upgrade. Prioritize survival, charged openings, and route knowledge.
THE STAR GEPPYS	THE STAR GEPPYS	This alternate-timeline parody changes presentation and story context. Do not skip its unique scenes if the Library is still incomplete.
Wild John of the Wasteland	Wild John	Expect a different weapon pattern rather than a reskinned Geppy-X. Relearn charge range and defensive input in the first safe section.
Queen Fairy, the Machine Angel	Queen Fairy	Use the unit’s own defensive rhythm and support identity. Confirm controls in the digital manual before a boss demands them.

Legacy PlayStation references contain title-screen inputs for several scenarios. They are deliberately not reproduced here. The 2026 store calls these modes unlockable, and no readable launch-build source confirmed that the old codes are necessary, supported, or harmless to progression in the remaster.

Use the Beast Library as a diagnostic screen#

Geppy-X Expert requires the entire Beast Library. The achievement text does not publish a count, and the launch sources do not provide a verified slot-by-slot checklist. That makes the in-game Library the authority.

1. Audit after every ending. Note which row or page gained entries. A blank beside a late-story character is more likely tied to a branch than to an early boss.
2. Vary documented boss finishers. The historical guide calls out distinct form-specific movies in Stages 2, 3, 6, and 7. Use those as targeted tests when nearby movie or enemy entries remain blank.
3. Clear all six extra modes. Alternate units and timelines contain material that cannot be seen in one main-story path.
4. Let scenes register before restoring a state. Reach the result or save point, open the Library, and confirm the entry exists. Rewinding before a scene commits may erase the very event being hunted.
5. Change one variable per replay. Use a different finishing form, branch, or extra scenario, then inspect the result. Changing everything at once makes the missing trigger impossible to diagnose.

Do not assume that switching between the restored and original movie presentation creates separate Library entries. Bliss Brain confirms that both versions are included in the product, but no readable evidence says the Library counts the display setting twice.

Fast fixes for the most expensive mistakes#

The wrong pilot leaves after Stage 4

The final damage came from the wrong form. Restore the pre-finisher state, stop all stray fire, change form, and deliver one controlled charged hit.

A large boss leaves no room

Stop following the sprite. Hold a repeatable lane, charge while the pattern is away, and use X2 or the tested transformation window before the safe pocket closes.

The final boss takes no damage

You are probably in the scripted barrier phase. Survive until the Atlanger event instead of spending X-Power into immunity.

A story clear did not fill the expected Library gap

Confirm the ending and Stage 4 achievements, then inspect the exact blank position. Test a documented form-specific boss finish before replaying the entire same route.

An extra unit feels unusable

Open the digital manual and rebuild the control model from zero. Wild John, Queen Fairy, ATLANGER, and R-64 are not simply X1 with different art.

Rewind keeps creating a worse loop

Go farther back than the hit. Rewind to the decision that removed your escape lane, then change form or position before the pattern begins.

Sources & credits#

Current release status, developer and publisher information, remaster features, combat-form roles, achievements, and original-resolution screenshots were checked against the official Geppy-X Steam page, Steam’s live achievement list, and the official Bliss Brain Geppy-X site. Stage checkpoints and branch mapping were cautiously cross-checked against an archived community guide and verified walkthrough references. Images belong to Aroma, Aoshima Bunka Kyozai, Bliss Brain, and Implicit Conversions.