Choose Rockjack
Choose Rockjack if you want an Early Access experience. On Steam, it's free to play, so the barrier to trying it is zero. Rockjack launched in 2020.
Rockjack vs Invaders from the Third Dimension
Rockjack and Invaders from the Third Dimension both land in Action, Indie, Casual on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both share Action, Indie, Casual on Steam. Rockjack (2020) is 3 years older than Invaders from the Third Dimension (2023). Rockjack is free; Invaders from the Third Dimension is paid (0.99 USD). No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.
Which should you pick?
Choose Invaders from the Third Dimension
Choose Invaders from the Third Dimension if it's the newer release (2023) and ships with the modern feature baseline. Invaders from the Third Dimension launched in 2023.
Both Rockjack and Invaders from the Third Dimension sit in Action, Indie, and Casual on Steam, so either pick lands in the same broad neighborhood. Use the side-by-side table for the feature view, or follow the "Games like" links below to see ranked alternatives for either title.
Side-by-side comparison
 Rockjack |  Invaders from the Third Dimension | |
|---|---|---|
| Released | 2020 | 2023 |
| Genres | Action, Indie, Casual, Early Access | Action, Indie, Casual |
| Platforms | Windows, macOS, Linux | Windows |
| Steam Deck | Deck Playable | Unrated |
| Price | Free to play | 0.99 USD |
| Steam reviews | 7 reviews | 2 reviews |
| Multiplayer | Single-player only | Single-player only |
| Developers | Man Cave Entertainment | Nile River Software LLC |
Side by side
- Both share Action, Indie, Casual on Steam.
- Rockjack (2020) is 3 years older than Invaders from the Third Dimension (2023).
- Rockjack is free; Invaders from the Third Dimension is paid (0.99 USD).
- Rockjack is Deck Playable on Steam Deck; Invaders from the Third Dimension has no Deck rating yet.
Rockjack vs Invaders from the Third Dimension — FAQ
- Should I play Rockjack or Invaders from the Third Dimension first?
- If you want chronology, Rockjack (2020) came out before Invaders from the Third Dimension (2023). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.
- Are Rockjack and Invaders from the Third Dimension similar?
- They overlap on Action, Indie, Casual on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.
- Is Rockjack free?
- Yes — Rockjack is a free-to-play Steam title. Invaders from the Third Dimension is paid (0.99 USD).
- Does Rockjack run on Steam Deck?
- Yes — Rockjack is rated Deck Playable by Valve. Invaders from the Third Dimension doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.