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→Training Resources, Starting Pixels and Timings
Castlevania graphics are made up of foreground sprites (simon, candles, hearts, enemies) and background tiles. The game is building up these background tiles ahead of what is actually on the screen behind the scenes so that it can scroll smoothly as Simon moves. Around half a screen offscreen, the game is drawing a column two blocks wide. When that is complete, the game moves onto the next column. It looks something like this:
[[File:CV1_ScrollGlitch1.updated.png|550px]]
=== Tile Update Algorithm ===
Unfortunately, this approach does have a few downsides. First, each turnback will cost an extra 4 frames. In addition, you will often have to do one extra turnback relative to the two pixel turnback. If targeting block 2 or 3, I would recommend 4 turnbacks. Anything below that, I would recommend 3 turnbacks.
=== Training Resources , Starting Pixels and Timings ===
ROMHack - A romhack is available on the CV1 discord. When used, it will print out Simon’s pixel coordinates. In addition, it will print the Block Counter.
The starting pixel coordinates for the scroll glitches are:
{| class="wikitable" style="margin:autoleft"
|+
|-
! Stage Number !! Pixel !! Savings**
|-
| Stage 6 Crusher || TO FILL IN 1D9 & 1B9 || ~ 9 sec
|-
| Stage 13 7 Coffee || A4 255 & 1F9 || ~ 1.4 sec
|-
| Stage 14 Wall 13 Griddle || 328 A4 || ~ 12.5 sec
|-
| Stage 14 Ceiling Drop Bacon || TO FILL IN45C or 43D || ~ 3.5 sec
|-
| Stage 14 Advanced Egg || 2C4* || ~ 6 sec
|-
| Stage 14 Cheese || 328 || ~ 8 sec|-| Stage 14 Race || 21C || ~ 8 sec|-| Stage 17 Clocktower || TO FILL IN 219 & 1FB || ~ 6 sec
|}
<nowiki>*</nowiki>Touching pixel 2B9 is needed before turning around
<nowiki>**</nowiki>Timings are approximate, also you may not see the same time savings if you don't play the rest of the level as optimal as your prior splits, example the 12 second saving of Stage 13 might turn into 6 seconds if you missed other things in level 5.
Stage 13:
If you are trying to learn a whipless rhythm approach, sounds can also be a helpful aid. You hit the buttons on the appropriate beat. Every frame is 1/60th of a second (technically 1/60.09), so you can use that to create a beat. One style is to do 4/60th of a second followed by 12/60th of a second. Another is to just have a metronome set to 16/60th of a second and time either your forward or backward presses to that beat.
=== Acknowledgements ===
{{#ev:youtube|zxLs7h2cL6Y|550}}
Displaced Gamers Video on the code
{{#ev:youtube|wd18YNZB0D4|550}}