5 GDD Templates That Work for Solo Developers

The best GDD template for a solo developer is the shortest one that forces the decision you are currently avoiding. In practice, five shapes cover almost every solo project: a one-pager for jams and first games, a core-loop sheet while you prototype, a milestone plan for a one-to-three month build, a decision log during development, and a store-page-first spec before release. Pick one, fill it in about an hour, and let it change when the design changes.

If you are unsure why you need a design document at all, start with why you need a GDD before coding; this article hands you the actual forms.

Why most GDD templates fail solo developers#

Search for "GDD template" and you will find documents with 15 sections: monetization plans, marketing matrices, team sign-off boxes. Those come from studio processes, where a design document's job is to coordinate a dozen people and survive approval meetings. A solo developer's document has a different job: to force three or four expensive decisions — what the game is, how big it is, when it is done — before they become expensive.

That is why the templates below are short on purpose. Each one trades completeness for the guarantee that you will actually fill it in and keep it current. A half-page document you maintain beats a 30-page document you abandon in week two.

Template	Best for	Length	Time to fill	Fails when
One-page GDD	Game jams, first games	1 page	Under an hour	The project outgrows one page
Core-loop sheet	Prototyping one mechanic	Half a page	20–30 minutes	The loop is fun but nothing else is decided
Milestone GDD	A 1–3 month project	2–3 pages	One evening	Milestones have no done criteria
Decision log	Development already underway	Grows over time	10 minutes a week	You log opinions instead of decisions
Store-page-first spec	The run-up to release	1–2 pages	2–3 hours	The page promises more than the scope can deliver

The templates are alternatives, not a checklist. Most projects use two or three of them in sequence, which is exactly how the "how to pick" section near the end frames it.

Template 1: The one-page GDD#

For a jam, a first game, or any project you intend to finish in weeks. The whole document is one page, and the discipline is that everything must stay on it.

GAME:        [title]
PITCH:       [genre + hook + platform, one sentence]
PLAYER:      [who this is for, one line]
LOOP:        [what the player does every 30 seconds]
CONTROLS:    [input scheme, one line]
V1 HAS:      [3–5 concrete bullets: levels, modes, content]
V1 LACKS:    [deliberate cuts, as long as the HAS list]
DONE WHEN:   [the exact state that counts as shipped]

Two tricks make this template work. Fill in V1 LACKS first and make it as long as V1 HAS — the cuts list is what keeps the project finishable, and finishing your first game is a scope problem before it is a skill problem. Then fill DONE WHEN with a state you can verify, not a feeling: "10 levels, menu, save, uploaded to itch.io" rather than "polished enough."

Template 2: The core-loop sheet#

Use this while prototyping, before anything else exists. It describes one mechanic in enough detail that you can tell whether it is worth building around. Loop-first design is standard practice, and the MDA framework — mechanics, dynamics, aesthetics — is the usual academic grounding for it.

VERB:        [the one thing the player does]
CHALLENGE:   [what makes the verb non-trivial]
REWARD:      [why doing it again feels worth it]
FAILURE:     [what happens when it goes wrong]
30 SECONDS:  [describe a random half-minute of play]
FUN BECAUSE: [the feeling, one honest line]

The 30 SECONDS field is the honest one. If you cannot narrate half a minute of ordinary play — not the tutorial, not the boss — the loop is not decided yet, and the prototype will tell you the same thing for free. Keep the sheet next to you while you test the idea fast; when the prototype contradicts a line, change the line.

Template 3: The milestone GDD#

For a project with a real calendar: one to three months of evenings. Instead of describing the finished game, this template describes the sequence of builds, each one ending in something playable.

M0 PROTOTYPE    core loop playable — done when: [testable state]
M1 VERTICAL     one scene/level with final-quality feel — done when: [...]
M2 CONTENT      all levels grey-boxed, all systems in — done when: [...]
M3 SHIPPABLE    art/audio final, store build uploaded — done when: [...]
BUFFER:         20–30% of the calendar, booked in advance

The rule that keeps this template honest: every milestone ends in a build you could show someone. If M1's done criterion reads "player movement code refactored," it is a task list, not a milestone — a build that can be played is the only evidence of progress that cannot lie. Book the buffer when you write the plan; every first project needs it, and the mistakes that kill indie projects are dominated by unbudgeted time.

Template 4: The decision log#

This is the living GDD in its most honest form: not a description of the game, but a dated record of the decisions that shaped it. Start it the day development starts, in a text file or a Notion database.

2026-08-17  Save format switched from XML to JSON.
WHY:        level data is hand-edited; XML errors cost a day.
REPLACES:   decision of 2026-07-02.
SCOPE:      unchanged.

Four fields: date, decision, why, what it replaces. The log never contains the future — only what already happened — which is why it cannot drift from the game the way a forward-looking spec does. Six months in, it doubles as the changelog skeleton for your release notes, and it answers the solo developer's hardest question — "why did I do it this way?" — months after you have forgotten.

Template 5: The store-page-first spec#

Write this about a month before release, and write it backwards: start from the promise, derive the work. The technique adapts the "working backwards" memo practice from Amazon, where a product starts as the press release it hopes to earn.

TITLE + TAGLINE:  what the store banner says
SCREENSHOTS (4):  what each screenshot must show
TRAILER BEATS:    5–8 beats, in order
TWO REVIEWS:      the sentences you want players to write
REQUIRED BY THE PROMISE:  features the page cannot live without
CUT TO MATCH:     features the promise does not require

The TWO REVIEWS field is the sharp one: players describe games in terms of feel and moment, and if you cannot picture the sentence you want, the promise is still vague. The last two fields do the real work — the store page is a scope-cutting instrument. Everything in "required by the promise" is now blocking release; everything else is optional. When the template forces a contradiction between what the page says and what the build has, believe the template and cut.

How to pick one#

Three questions, in order:

1. Have you prototyped the core loop? No — take the core-loop sheet; nothing else matters yet. Yes — continue.
2. Is this a jam or a first game? Take the one-page GDD. You will finish it, which is the whole test.
3. Is this a scoped project heading to release? Chain the rest: milestone GDD when you commit to the calendar, decision log from the first week, store-page-first spec about a month out.

If you are new to the concepts these templates force — core loop, target player, definition of done — the game design basics guide walks through each one.

Mistakes that break any template#

Mistake	Why it hurts	What to do instead
Copying a studio template	15 sections nobody maintains solo	Take the smallest template that fits the stage
Filling several templates "to be thorough"	They are alternatives, not a checklist	One active template per stage
Leaving DONE WHEN blank	The project gains no end condition	Fill it first, with a verifiable state
Treating the filled form as final	Design that cannot change goes stale	Date every edit; templates 4 and 5 exist to change
Listing features instead of content	"More enemies" hides real scope	Count levels, scenes, assets — numbers you can hit
Writing the document instead of the prototype	Untested loops produce fiction	Core-loop sheet and prototype in the same week

How Egmatic fits#

Every template above ends in the same field by another name: a state that counts as shipped. Egmatic is built to make that field cheap to reach — a 2D editor where you lay out scenes, wire logic through nodes, and export to desktop, web, and mobile without a build pipeline. A milestone that ends in "a build someone can play" stops being a ceremony and becomes an export; a decision log entry stops being a promise when the live preview shows the change in seconds.

If the chain from decision to shipped build is what you are optimizing for, the rapid prototyping tutorial covers the loop-first workflow these templates assume, and the guide to publishing without coding covers the last milestone of all.

The bottom line#

A GDD template earns its keep by being finished. Take the one that matches your stage — core-loop sheet while prototyping, one-pager for jams and first games, milestone plan for a real calendar, decision log from week one, store-page-first spec before release — fill it in one sitting, and keep the definition-of-done field honest. The document is not the deliverable; the shipped game is. The template is just the shortest known path from one to the other.

Sources#

1. Loop-first design and the mechanics–dynamics–aesthetics framing — Robin Hunicke, Robert LeBlanc, Marc Zubek, MDA: A Formal Approach to Game Design and Game Research (2004)
2. What a real pre-production document looks like, including how fast one can drift from the game — Tom Hall's Doom Bible (1992)
3. The working-backwards memo technique adapted in template 5 — Colin Bryar and Bill Carr, Working Backwards (2021)