diff --git a/config/sly1.yaml b/config/sly1.yaml
index 262e9bf9..db3fcec1 100644
--- a/config/sly1.yaml
+++ b/config/sly1.yaml
@@ -78,15 +78,15 @@ segments:
     - [0x1f560, c, P2/brx]
     - [0x1fe70, asm, P2/ac]
     #- [0x, asm, P2/act]
-    #- [0x, asm, P2/actseg]
+    - [0x23f28, c, P2/actseg]
     - [0x243c0, asm, P2/alarm]
     - [0x24dc0, asm, P2/alo]
     #- [0x, asm, P2/aseg]
     #- [0x, asm, P2/asega]
     #- [0x, asm, P2/barrier]
     - [0x30cf0, asm, P2/bas]
-    - [0x310e8, asm, P2/basic]
-    - [0x31168, asm, P2/bez]
+    - [0x310e8, c, P2/basic]
+    - [0x31168, c, P2/bez]
     - [0x31f48, c, P2/binoc]
     - [0x38290, c, P2/bis]
     - [0x395a0, asm, P2/bbmark]
@@ -200,8 +200,8 @@ segments:
     #- [0x, asm, P2/shape]
     - [0xb3988, asm, P2/shd]
     - [0xb5920, asm, P2/shdanim]
-    #- [0x, asm, P2/sky]
-    #- [0x, asm, P2/slotheap]
+    - [0xb6cd8, c, P2/sky]
+    - [0xb6d80, asm, P2/slotheap]
     - [0xb6f50, asm, P2/sm]
     #- [0x, asm, P2/smartguard]
     - [0xb8968, asm, P2/so]
diff --git a/config/symbol_addrs.txt b/config/symbol_addrs.txt
index 3a031e0c..dbde958d 100644
--- a/config/symbol_addrs.txt
+++ b/config/symbol_addrs.txt
@@ -374,6 +374,37 @@ LoadSwObjectsFromBrx__FP2SWP3ALOP18CBinaryInputStream = 0x11ECB8; // type:func
 SetLoDefaults__FP2LO = 0x11EDA8; // type:func
 
 
+////////////////////////////////////////////////////////////////
+// P2/actseg.c
+////////////////////////////////////////////////////////////////
+RetractActseg__FP6ACTSEGi = 0x122F28; // type:func
+CloneActseg__FP6ACTSEGT0 = 0x122F88; // type:func
+GetActsegPositionGoal__FP6ACTSEGfP6VECTORT2 = 0x122FE0; // type:func
+GetActsegRotationGoal__FP6ACTSEGfP7MATRIX3P6VECTOR = 0x123120; // type:func
+GetActsegTwistGoal__FP6ACTSEGPfT1 = 0x123270; // type:func
+GetActsegScale__FP6ACTSEGP7MATRIX3 = 0x1232E8; // type:func
+GGetActsegPoseGoal__FP6ACTSEGi = 0x123358; // type:func
+
+
+////////////////////////////////////////////////////////////////
+// P2/basic.c
+////////////////////////////////////////////////////////////////
+FIsBasicDerivedFrom__FP5BASIC3CID = 0x1300e8; // type:func
+EnsureBasicSidebag__FP5BASIC = 0x130110; // type:func
+
+
+////////////////////////////////////////////////////////////////
+// P2/bez.c
+////////////////////////////////////////////////////////////////
+EvaluateBezierWeightedFloat__FfffffffffPfN29 = 0x130168; // type:func
+EvaluateBezierFloat__FfffffffPfN27 = 0x1303F0; // type:func
+EvaluateBezierPos__FfffP6VECTORN63 = 0x130540; // type:func
+EvaluateBezierMat__FfffP7MATRIX3P6VECTORT3T4T3T4T4 = 0x130748; // type:func
+TesselateBezier__FfffP6VECTORN33iT3 = 0x130B48; // type:func
+SBezierPosLength__FffP6VECTORN32 = 0x130C20; // type:func
+LimitBezierMulti__Fie = 0x130C58; // type:func
+
+
 ////////////////////////////////////////////////////////////////
 // P2/binoc.c
 ////////////////////////////////////////////////////////////////
@@ -1172,6 +1203,13 @@ g_unkblot11 = 0x26eed0; // size:0x280
 g_totals = 0x26f138; // size:0x280
 
 
+////////////////////////////////////////////////////////////////
+// P2/sky.c
+////////////////////////////////////////////////////////////////
+PostSkyLoad__FP3SKY = 0x1c9a18; // type:func
+UpdateSky__FP3SKYf = 0x1c9a58; // type:func
+
+
 ////////////////////////////////////////////////////////////////
 // P2/sound.c
 ////////////////////////////////////////////////////////////////
diff --git a/include/basic.h b/include/basic.h
index 58183213..7b1b6d30 100644
--- a/include/basic.h
+++ b/include/basic.h
@@ -8,6 +8,7 @@
 
 #include "common.h"
 #include <splice/sidebag.h>
+#include <cid.h>
 
 /**
  * @brief Basic object.
@@ -22,4 +23,30 @@ struct BASIC
     CSidebag *psidebag;
 };
 
+/**
+ * @brief Check if the basic object is derived from the given class ID.
+ *
+ * @param pbasic The object.
+ * @param cid The class ID to check.
+ *
+ * @retval 1 if the object is derived from the class.
+ * @retval 0 if the object is not derived from the class.
+ */
+int FIsBasicDerivedFrom(BASIC *pbasic, CID cid);
+
+/**
+ * @brief Check if the basic has a sidebag, and if not, create one.
+ *
+ * @param pbasic The object.
+ */
+void EnsureBasicSidebag(BASIC *pbasic);
+
+/**
+ * @brief Get the basic object's CID.
+ *
+ * @param pbasic The object.
+ * @param pcid Return CID.
+ */
+void GetBasicCid(BASIC *pbasic, CID *pcid);
+
 #endif // BASIC_H
diff --git a/include/bez.h b/include/bez.h
index 8bb6fe7e..8dfb9c79 100644
--- a/include/bez.h
+++ b/include/bez.h
@@ -1,11 +1,24 @@
 /**
  * @file bez.h
+ *
+ * @brief Bezier curves.
+ *
+ * @todo Add function parameters and documentation.
  */
 #ifndef BEZ_H
 #define BEZ_H
 
 #include "common.h"
+#include <vec.h>
+#include <mat.h>
 
-// ...
+void EvaluateBezierWeightedFloat(float, float, float, float, float, float, float, float, float, float *, float *, float *);
+void EvaluateBezierFloat(float, float, float, float, float, float, float, float *, float *, float *);
+void EvaluateBezierPos(float, float, float, VECTOR *, VECTOR *, VECTOR *, VECTOR *, VECTOR *, VECTOR *, VECTOR *);
+void EvaluateBezierMat(float, float, float, MATRIX3 *, VECTOR *, MATRIX3 *, VECTOR *, MATRIX3 *, VECTOR *, VECTOR *);
+void TesselateBezier(float, float, float, VECTOR *, VECTOR *, VECTOR *, VECTOR *, int, VECTOR *);
+float SBezierPosLength(float, float, VECTOR *, VECTOR *, VECTOR *, VECTOR *);
+
+void LimitBezierMulti(int c, ...);
 
 #endif // BEZ_H
diff --git a/include/sky.h b/include/sky.h
new file mode 100644
index 00000000..83066ce5
--- /dev/null
+++ b/include/sky.h
@@ -0,0 +1,37 @@
+/**
+ * @file sky.h
+ *
+ * @brief Skyboxes.
+ */
+#ifndef SKY_H
+#define SKY_H
+
+#include "common.h"
+
+/**
+ * @brief Skybox structure.
+ *
+ * @todo Fill out the structure.
+ */
+struct SKY
+{
+    // ...
+};
+
+/**
+ * @brief Initializes the sky with default values.
+ * Calls super function PostAloLoad().
+ *
+ * @param psky Pointer to the sky.
+ */
+void PostSkyLoad(SKY *psky);
+
+/**
+ * @brief Updates the given sky.
+ *
+ * @param psky Pointer to the sky.
+ * @param dt Delta time.
+ */
+void UpdateSky(SKY *psky, float dt);
+
+#endif // SKY_H
diff --git a/include/sw.h b/include/sw.h
index 0b11804f..03be7d4a 100644
--- a/include/sw.h
+++ b/include/sw.h
@@ -17,4 +17,6 @@ struct SW
 
 extern SW *g_psw;
 
+void IncrementSwHandsOff(SW *psw);
+
 #endif // SW_H
diff --git a/src/P2/actseg.c b/src/P2/actseg.c
new file mode 100644
index 00000000..87095cee
--- /dev/null
+++ b/src/P2/actseg.c
@@ -0,0 +1,15 @@
+#include "common.h"
+
+INCLUDE_ASM(const s32, "P2/actseg", RetractActseg__FP6ACTSEGi);
+
+INCLUDE_ASM(const s32, "P2/actseg", CloneActseg__FP6ACTSEGT0);
+
+INCLUDE_ASM(const s32, "P2/actseg", GetActsegPositionGoal__FP6ACTSEGfP6VECTORT2);
+
+INCLUDE_ASM(const s32, "P2/actseg", GetActsegRotationGoal__FP6ACTSEGfP7MATRIX3P6VECTOR);
+
+INCLUDE_ASM(const s32, "P2/actseg", GetActsegTwistGoal__FP6ACTSEGPfT1);
+
+INCLUDE_ASM(const s32, "P2/actseg", GetActsegScale__FP6ACTSEGP7MATRIX3);
+
+INCLUDE_ASM(const s32, "P2/actseg", GGetActsegPoseGoal__FP6ACTSEGi);
diff --git a/src/P2/basic.c b/src/P2/basic.c
new file mode 100644
index 00000000..0b21af82
--- /dev/null
+++ b/src/P2/basic.c
@@ -0,0 +1,7 @@
+#include <basic.h>
+
+INCLUDE_ASM(const s32, "P2/basic", FIsBasicDerivedFrom__FP5BASIC3CID);
+
+INCLUDE_ASM(const s32, "P2/basic", EnsureBasicSidebag__FP5BASIC);
+
+INCLUDE_ASM(const s32, "P2/basic", func_00130158);
diff --git a/src/P2/bez.c b/src/P2/bez.c
new file mode 100644
index 00000000..4ca5b91c
--- /dev/null
+++ b/src/P2/bez.c
@@ -0,0 +1,15 @@
+#include <bez.h>
+
+INCLUDE_ASM(const s32, "P2/bez", EvaluateBezierWeightedFloat__FfffffffffPfN29);
+
+INCLUDE_ASM(const s32, "P2/bez", EvaluateBezierFloat__FfffffffPfN27);
+
+INCLUDE_ASM(const s32, "P2/bez", EvaluateBezierPos__FfffP6VECTORN63);
+
+INCLUDE_ASM(const s32, "P2/bez", EvaluateBezierMat__FfffP7MATRIX3P6VECTORT3T4T3T4T4);
+
+INCLUDE_ASM(const s32, "P2/bez", TesselateBezier__FfffP6VECTORN33iT3);
+
+INCLUDE_ASM(const s32, "P2/bez", SBezierPosLength__FffP6VECTORN32);
+
+INCLUDE_ASM(const s32, "P2/bez", LimitBezierMulti__Fie);
diff --git a/src/P2/sky.c b/src/P2/sky.c
new file mode 100644
index 00000000..f1834ad6
--- /dev/null
+++ b/src/P2/sky.c
@@ -0,0 +1,5 @@
+#include "sky.h"
+
+INCLUDE_ASM(const s32, "P2/sky", func_001B5CD8);
+
+INCLUDE_ASM(const s32, "P2/sky", func_001B5D28);
diff --git a/src/P2/xform2.c b/src/P2/xform2.c
index c2e51893..bd37f517 100644
--- a/src/P2/xform2.c
+++ b/src/P2/xform2.c
@@ -1,4 +1,5 @@
 #include <xform.h>
+#include <sw.h>
 
 INCLUDE_ASM(const s32, "P2/xform2", LoadWarpFromBrx__FP4WARPP18CBinaryInputStream);