Ok, So There Is About 150 Characters In Undertale.
Every One Of Them Has About 80 Sprites.
80 x 150 = 12,000.
for the objects, theres probably about 700.
Multiply It By Two, Bc I Assume The Average Sprites Per Object Is Two
13,400 sprites so far.
About 300 Rooms In Undertale, And Each Of Them Get A Sprite.
13,700 sprites.
we have the buttons, which is 4, the letters, 26.
13,730.
Flowey, Toriel, Sans, Papyrus, Undyne, Alphys, Asgore, And Asriel All Have Sprites When They Speak.
About 70 Per Character.
560 speaking sprites.
14,290 sprites.
the human souls are an obvious exception for characters, so add six.
14,296 sprites.
the main menu sprites. there is about 20 images at the start of the game, plus the "undertale" title.
14,311 sprites.
omega flowey is composed of about 60 images in one.
14,371.
for the attacks, theres roughly about 800 different stuff.
15,171.
and for the 70 characters that have battle sprites, 15,241.
now we add the blue and yellow text sprites, which is 15,293 sprites.
including 11 sprites for numbers and an asterisk, 15,304 sprites.
adding up minor things, like mettatons ratings, the text box, the battle background, and more we have about...
15,477 sprites.