1. Open Deltapatcher.exe
2. Put the .xdelta file in "XDelta patch"
3. Put the data.win of Undertale in "Original File"
4. Press apply patch
5. Drag the splash.png and .ogg file into where the data.win is located and accept replacing it.
6. Remove steamapi.dll if you haven't
7. Enjoy!

IMPORTANT INFO:

1.You can skip text quickly with C and run with X or SHIFT, It's also not recommended to play Pacifist as there's little changes.

Mods I was inspired by:

PS!Outertale by Spacey

Undertale Yellow by The Undertale Yellow Team

Undertale Red and Yellow by Shinix

Credit:

New Battle buttons by Karakun
New Target attack battle thing by a guy with too much time
New run sprites and Doge sprites by Funtermore
(not being updated anymore it's on the gamebanana page)
All Features listed below: Spoiler warning!! (No longer updated)








































1. Rounded menus, textboxes, and healthbars
2. New colored text
3. A new second genocide route with bosses such as:
3.1: Early Sans: Sans now appears in snowdin with some different dialogue then normal
3.2: Undyne X: Like neutral Undyne, but deals way more damage, every spear is yellow, and way harder red attacks
3.3: Mettaton ULTRA: Uses the new PATIENCE soul which moves slower but can dash. has a 25 turn limit after which you die.
3.4: Asgore: Has harder attacks, a new orange soul mode, 4.5M HP and takes ~200K Damage with Real Knife.
4. Fixed some bugs in Snowdin relating to genocide music
5. Gave Toriel, Muffet, and RG 01 & 02 boss fights on all Genocide routes
6. Mettaton NEO gives 3000 EXP instead of setting your LV to 19, LV 16 also only requires 8000 EXP now
7. Enemy per area counts lowered.
7.1 RUINS - 20 -> 16
7.2 Snowdin - 16 -> 11
7.3 Waterfall - 18 -> 8
7.4 Hotland - 40 -> 7
8. You can no longer grind in CORE.
9. HP bar changes color based on boss.
10. After killing 10 monsters in RUINS, music will be slowed, and * (6 Left.) will be displayed on the SAVE point.
11. Sans gives 5000 EXP but sets your LV to 20
12. Asgore gives 7500 EXP (This can't be seen as you can't access the menu before Chara destroys the game)
13. Undying fight reworked
14. Last remaining enemies in each area will have new music, harder attacks, and higher stats (Besides HP), and new check descriptions
15. Muffet has been relocated to Waterfall
16. Glad Dummy now gives 42 EXP
17. Bosses now give G.
17.1: Toriel - 200 G
17.2: Papyrus - 50 G
17.3: Undyne (Neutral and Undying) - 500 G
17.4: Mettaton (NEO and EX) - 2500 G
18. You can start a Suto-Genocide route (Called Desolance Route) from any area!
19. Manly Bandanna now gives 2 Extra ATK!
20. Made But Nobody Came not annoying as fuck
21. New rooms in Waterfall!
22. Enemy per area counts now depend on route
22.1: Snowdin has 13 in pacifist
22.2: Waterfall has 12 on pacifist
22.3: Hotland has 11 on pacifist
23. Battle menu textures have been changed.
24. "Rude" acts now give extra exp upon an enemy dying
25. "Nice" acts now have variations when enemies have low hp.
26. Gun has six bars
27. There's new Blue Crystal, Red Crystal, Cyan Crystal, and Green Crystal items as secrets.
28. New "Darker Neutral" route upon killing Undyne in Neutral
29. Tough glove needs one less input.
30. Temmie armor is now accesible in Genocide.
31. New defense system 1 DEF = 1 less DMG
32. New LUCK stat, gives extra damage.
33. New SPEED stat, determines flee chance, old speed is now SOUL SPEED
34. Sea Tea heals based on SPEED, stairfait heals based on LUCK.
35. Armor defense nerfed because of new defense system
35.1: Ribbon 3 -> 1
35.2: Bandanna 7 -> 3
35.3: Tutu 10 -> 5
35.4: Apron 11 -> 7
35.5: Cowboy Hat 12 -> 8
35.6: Heart Locket 15 -> +10 MAXHP
35.7: The Locket 99 -> 99
35.8: Temmie Armor 20 -> 15
36. ATK and DEF display in battle.
37. Monster ATK, DEF, MAXHP, and HP display in battle.
38. Crab Apple gives +1 ATK, Nice cream gives -1 ATK and +2 LUCK.
39. Rock Candy gives one of every stat besides SOUL SPEED, and lowers SPEED to -255
40. If you kill Undyne and have above 10 kills Mettaton becomes Mettaton X
41. Many bug fixes, and more features that I forgot about.
42. I'm no longer adding features to this page, sorry.