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Submission #2547: Lord Tom's NES Metroid "low%" in 11:08.78

Console: Nintendo Entertainment System
Game name: Metroid
Game version: USA PRG0
ROM filename: Metroid (U) (PRG0) [!].nes
Branch: low%
Emulator: (unknown)
Movie length: 11:08.78
FrameCount: 40193
Re-record count: 49541
Author's real name: Thomas Seufert
Author's nickname: Lord Tom
Submitter: Lord Tom
Submitted at: 2010-01-17 18:48:46
Text last edited at: 2011-01-02 00:57:45
Text last edited by: Nahoc
Download: Download (10654 bytes)
Status: published
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Author's comments and explanations:

(Link to video)

This is NES "Low %" Metroid, which beats the game collecting only the morph ball. The submission improves the published run by 36.7s (2204 frames) using a new route and better optimized platforming, boss fighting and lag reduction.

Goals

  • Collects only the morph ball
  • As fast as possible
  • Emulator: FCEUX 2.1.2, Old PPU

Intro

Well, I meant to do this run shortly after I finished the 100%, but got busy/lazy. Sgrunt's submission got me off my butt -- thanks. I knew it could be improved using a different route, though prior to starting I estimated the improvement at only 10-15s.

Details

Here's a summary of where time was saved compared to the published run. In summary, most time is saved by general optimizations. The new route loses 1 second getting to Kraid and 2 seconds fighting Kraid (no missiles), but saves many more seconds later due to the availability of missiles in Norfair and Ridley's areas.

Note that since different routes are used, I compare using the total time spent in each area, rather than in strict sequential fashion. The various areas are listed in the order they're first visited in my run. The times listed here are close, but not necessarily exact.

Location Published Submission Difference (f)
Brinstar 15726 15288 -438
Kraid's Lair 4181 4242 +61
Boss: Kraid 452 585 +133
Norfair 6072 5829 -243
Ridley's Lair 6270 5837 -433
Boss: Ridley 715 371 -344
Tourian 5146 4653 -493
Boss: Zebetites 1410 1174 -236
Boss: Mother Brain 1300 1105 -195
Escape 1118 1095 -23
Lag 2228 1598 -630

The key to the route is to sacrifice some time to kill Kraid first. This gets Samus a hefty stock of missiles, which makes the loooooong journey to Ridley, and the Ridley fight itself, much faster. The 2 main reasons are that missiles can kill at a distance, and can kill any non-boss/invincible creature in 1 hit. The former gives more options for refill collection and lag reduction. The latter lets Samus take shorter paths, with less lag because she can blast her way through just about anything. This is especially true in Ridley's lair, where in the 2 previous runs Samus is all but helpless -- unable to take damage, unable to kill anything -- and ends up losing a lot of time dodging enemies, not to mention lag.

The rest of the improvement was just optimization -- minimizing jumps and stops, maximizing damage boosts and luck manipulation. To avoid endless explanation, a lot of the tricks of the game are already described at the Metroid Tricks Page, the Metroid Any% run, and the Metroid 100% run.

One new discovery I found making this run was that vertical climbs are infinitely less tedious if you just focus on the small jumps where Samus must cross a significant horizontal span. The key is to hit the previous platform close enough to the edge (actually, off the edge) that the jump button can be held for 1 fewer frame. For all other jumps, apart from killing enemies and getting drops if they're needed, it doesn't really matter what Samus does.

Thanks to Sgrunt for describing a technique for manipulating monster appearance of which I wasn't aware -- having a dead monster leave an uncollected drop when the next screen is loaded is the same as having the monster still alive. This was very valuable to know in several rooms throughout the run.

I highlight many other interesting strategies in the subtitles, which is hopefully a more accessible way for people to understand what's going on than describing them at length here. I hope the encoders will include them if possible. If you find the subtitles distracting, you can always shut them off.


Nach: Accepting as excellent improvement to existing run. May I also say that this run is very nicely optimized, with high attention paid to every detail.

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