diff --git a/OTFbuild/sheet_config.py b/OTFbuild/sheet_config.py
index c35673e..e21e709 100644
--- a/OTFbuild/sheet_config.py
+++ b/OTFbuild/sheet_config.py
@@ -74,6 +74,7 @@ SHEET_CONTROL_PICTURES_VARW = 40
 SHEET_LEGACY_COMPUTING_VARW = 41
 SHEET_CYRILIC_EXTB_VARW = 42
 SHEET_CYRILIC_EXTA_VARW = 43
+SHEET_CYRILIC_EXTC_VARW = 44
 
 SHEET_UNKNOWN = 254
 
@@ -122,6 +123,7 @@ FILE_LIST = [
     "symbols_for_legacy_computing_variable.tga",
     "cyrilic_extB_variable.tga",
     "cyrilic_extA_variable.tga",
+    "cyrilic_extC_variable.tga",
 ]
 
 CODE_RANGE = [
@@ -169,6 +171,7 @@ CODE_RANGE = [
     list(range(0x1FB00, 0x1FC00)),                                                  # 41: Legacy Computing
     list(range(0xA640, 0xA6A0)),                                                    # 42: Cyrillic Ext B
     list(range(0x2DE0, 0x2E00)),                                                    # 43: Cyrillic Ext A
+    list(range(0x1C80, 0x1C8F)),                                                    # 43: Cyrillic Ext C
 ]
 
 CODE_RANGE_HANGUL_COMPAT = range(0x3130, 0x3190)
@@ -547,5 +550,6 @@ def index_y(sheet_index, c):
         SHEET_LEGACY_COMPUTING_VARW: lambda: (c - 0x1FB00) // 16,
         SHEET_CYRILIC_EXTB_VARW: lambda: (c - 0xA640) // 16,
         SHEET_CYRILIC_EXTA_VARW: lambda: (c - 0x2DE0) // 16,
+        SHEET_CYRILIC_EXTC_VARW: lambda: (c - 0x1C80) // 16,
         SHEET_HANGUL: lambda: 0,
     }.get(sheet_index, lambda: c // 16)()
diff --git a/demo.PNG b/demo.PNG
index 2477146..52a6834 100644
Binary files a/demo.PNG and b/demo.PNG differ
diff --git a/demotext_unaligned.txt b/demotext_unaligned.txt
index 7684643..8e771f5 100755
--- a/demotext_unaligned.txt
+++ b/demotext_unaligned.txt
@@ -127,8 +127,7 @@ How multilingual? Real multilingual!
 ⁃ Currency Symbols
 ⁃ Cyrillic
 ⁃ Cyrillic Supplement
-⁃ Cyrillic Extended-A
-⁃ Cyrillic Extended-B
+⁃ Cyrillic Extended-A/B/C
 ⁃ Devanagari
 ⁃ Enclosed Alphanumeric Supplement
 ⁃ General Punctuations
diff --git a/src/assets/cyrilic_extB_variable.tga b/src/assets/cyrilic_extB_variable.tga
index 3ffca9e..a02f816 100644
--- a/src/assets/cyrilic_extB_variable.tga
+++ b/src/assets/cyrilic_extB_variable.tga
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:3f05f970173f7c2c830e7567a21fe18691f31205565296c429ecb60f0344e7f6
+oid sha256:4755fd5ae329c3a73f4c87b95c0159276e09373b6be2f1a3fbef2aec731d5e76
 size 122898
diff --git a/src/assets/cyrilic_extC_variable.tga b/src/assets/cyrilic_extC_variable.tga
new file mode 100644
index 0000000..1186267
--- /dev/null
+++ b/src/assets/cyrilic_extC_variable.tga
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:888d0f6c4de9874cc493d037b8724e7f25218f1b17d6b4b0a99bbbf3952ba30a
+size 20498
diff --git a/src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt b/src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt
index ba32f84..281c783 100755
--- a/src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt
+++ b/src/net/torvald/terrarumsansbitmap/gdx/TerrarumSansBitmap.kt
@@ -890,6 +890,7 @@ class TerrarumSansBitmap(
             SHEET_LEGACY_COMPUTING_VARW -> legacyComputingIndexY(ch)
             SHEET_CYRILIC_EXTB_VARW -> cyrilicExtBIndexY(ch)
             SHEET_CYRILIC_EXTA_VARW -> cyrilicExtAIndexY(ch)
+            SHEET_CYRILIC_EXTC_VARW -> cyrilicExtCIndexY(ch)
             else -> ch / 16
         }
 
@@ -2615,6 +2616,7 @@ class TerrarumSansBitmap(
         internal const val SHEET_LEGACY_COMPUTING_VARW = 41
         internal const val SHEET_CYRILIC_EXTB_VARW = 42
         internal const val SHEET_CYRILIC_EXTA_VARW = 43
+        internal const val SHEET_CYRILIC_EXTC_VARW = 44
 
         internal const val SHEET_UNKNOWN = 254
 
@@ -2727,6 +2729,7 @@ class TerrarumSansBitmap(
             0x1FB00..0x1FBFF, // SHEET_LEGACY_COMPUTING_VARW
             0xA640..0xA69F, // SHEET_CYRILIC_EXTB_VARW
             0x2DE0..0x2DFF, // SHEET_CYRILIC_EXTA_VARW
+            0x1C80..0x1C8F, // SHEET_CYRILIC_EXTC_VARW
         )
         private val codeRangeHangulCompat = 0x3130..0x318F
 
@@ -3079,6 +3082,7 @@ class TerrarumSansBitmap(
         private fun legacyComputingIndexY(c: CodePoint) = (c - 0x1FB00) / 16
         private fun cyrilicExtBIndexY(c: CodePoint) = (c - 0xA640) / 16
         private fun cyrilicExtAIndexY(c: CodePoint) = (c - 0x2DE0) / 16
+        private fun cyrilicExtCIndexY(c: CodePoint) = (c - 0x1C80) / 16
 
         val charsetOverrideDefault = Character.toChars(CHARSET_OVERRIDE_DEFAULT).toSurrogatedString()
         val charsetOverrideBulgarian = Character.toChars(CHARSET_OVERRIDE_BG_BG).toSurrogatedString()
diff --git a/work_files/cyrilic_extB_variable.kra b/work_files/cyrilic_extB_variable.kra
index e3e418d..b89fd7f 100644
--- a/work_files/cyrilic_extB_variable.kra
+++ b/work_files/cyrilic_extB_variable.kra
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:5517e2520430cda3026b47df735d1068ec3bc2e3a0f625902200e76394d2c957
-size 60185
+oid sha256:eb6b2b248f480a6921d0ad57597d565b3edc27b6a71e8673b70740c5441cbe42
+size 60189
diff --git a/work_files/cyrilic_extC_variable.kra b/work_files/cyrilic_extC_variable.kra
new file mode 100644
index 0000000..9263f0a
--- /dev/null
+++ b/work_files/cyrilic_extC_variable.kra
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8512f6ca9230847ecc9adb7dbd22ad245e33c290c5460fc95dc41b4f59081cdd
+size 42728