diff --git a/README.md b/README.md
index 9240c35..96dd87f 100644
--- a/README.md
+++ b/README.md
@@ -82,7 +82,7 @@ build
         - [x] Return values (type checked)
         - [x] Arguments for functions
         - [x] Jumping within functions
-    - [ ] Custom data structures
+    - [x] Custom data structures
     - [ ] Working with external libraries
 
 ## Debugger
@@ -114,6 +114,7 @@ Supported instructions so far:
 * inequal
 * greater
 * lesser
+* not
 * jump
 * if
 * @ (label creation)
diff --git a/include/groundvm.h b/include/groundvm.h
index 58bb07a..7fbad50 100644
--- a/include/groundvm.h
+++ b/include/groundvm.h
@@ -14,7 +14,7 @@
 #include <uthash.h>
 
 typedef enum GroundInstType {
-    IF, JUMP, END, INPUT, PRINT, PRINTLN, SET, GETTYPE, EXISTS, SETLIST, SETLISTAT, GETLISTAT, GETLISTSIZE, LISTAPPEND, GETSTRSIZE, GETSTRCHARAT, ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, INEQUAL, NOT, GREATER, LESSER, STOI, STOD, TOSTRING, FUN, RETURN, ENDFUN, PUSHARG, CALL, STRUCT, ENDSTRUCT, INIT, USE, EXTERN, CREATELABEL, PAUSE, DROP, ERRORCMD
+    IF, JUMP, END, INPUT, PRINT, PRINTLN, SET, GETTYPE, EXISTS, SETLIST, SETLISTAT, GETLISTAT, GETLISTSIZE, LISTAPPEND, GETSTRSIZE, GETSTRCHARAT, ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, INEQUAL, NOT, GREATER, LESSER, STOI, STOD, TOSTRING, FUN, RETURN, ENDFUN, PUSHARG, CALL, STRUCT, ENDSTRUCT, INIT, GETFIELD, SETFIELD, USE, EXTERN, CREATELABEL, PAUSE, DROP, ERRORCMD
 } GroundInstType;
 
 typedef enum GroundValueType {
@@ -58,6 +58,7 @@ typedef struct GroundError {
  */
 typedef struct GroundValue {
     GroundValueType type;
+    struct GroundStruct* customType;
     union {
         int64_t intVal;
         double doubleVal;
@@ -170,6 +171,7 @@ GroundProgram groundCreateProgram();
 void groundAddInstructionToProgram(GroundProgram* program, GroundInstruction instruction);
 GroundValue groundRunProgram(GroundProgram* program);
 void groundPrintProgram(GroundProgram* program); 
+char* groundCompileProgram(GroundProgram* program);
 
 GroundInstruction groundCreateInstruction(GroundInstType type);
 void groundAddValueToInstruction(GroundInstruction* inst, GroundValue value);
diff --git a/src/compiler.c b/src/compiler.c
index 716aed9..b2c2dcb 100644
--- a/src/compiler.c
+++ b/src/compiler.c
@@ -221,6 +221,33 @@ char* compileGroundProgram(GroundProgram* program) {
 
                 break;
             }
+            case NOT: {
+                if (gi.args.length < 2) {
+                    runtimeError(TOO_FEW_ARGS, "Expecting 2 args", &gi, i);
+                }
+                if (gi.args.length > 2) {
+                    runtimeError(TOO_MANY_ARGS, "Expecting 2 args", &gi, i);
+                }
+                if (gi.args.args[0].type != VALUE && gi.args.args[0].type != VALREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting an Int (for now) for arg 1", &gi, i);
+                }
+                if (gi.args.args[1].type != DIRREF) {
+                    runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef", &gi, i);
+                }
+
+                char* varName = gi.args.args[1].value.refName;
+
+                APPEND_ESTR(start, "  ; not\n");
+                APPEND_ESTR(start, "  mov rax, ");
+                APPEND_ESTR(start, processValueString(gi.args.args[0]));
+                APPEND_ESTR(start, "\n");
+                APPEND_ESTR(start, "  xor rax, 1\n");
+                APPEND_ESTR(start, "  mov [");
+                APPEND_ESTR(start, varName);
+                APPEND_ESTR(start, "], rax\n");
+
+                break;
+            }
             case ADD: {
                 if (gi.args.length < 3) {
                     runtimeError(TOO_FEW_ARGS, "Expecting 2 args for add instruction", &gi, i);
diff --git a/src/interface.c b/src/interface.c
index 2f41515..511cb43 100644
--- a/src/interface.c
+++ b/src/interface.c
@@ -1,5 +1,6 @@
 #include "parser.h"
 #include "interpreter.h"
+#include "compiler.h"
 #include "types.h"
 
 #include <stdlib.h>
@@ -123,3 +124,7 @@ void groundAddValueToScope(GroundScope* gs, const char* name, GroundValue value)
 void groundAddFieldToStruct(GroundStruct* gstruct, char* name, GroundValue field) {
     addFieldToStruct(gstruct, name, field);
 }
+
+char* groundCompileProgram(GroundProgram* program) {
+    return compileGroundProgram(program);
+}
diff --git a/src/interpreter.c b/src/interpreter.c
index 0dbb3ca..dc4956e 100644
--- a/src/interpreter.c
+++ b/src/interpreter.c
@@ -2028,6 +2028,77 @@ GroundValue interpretGroundInstruction(GroundInstruction inst, GroundScope* scop
             break;
         }
 
+        /*
+         * OBJECTS
+         * Allows manipulation of Ground objects.
+         */
+        // getfield $obj &field &result
+        case GETFIELD: {
+            if (in->args.length < 3) {
+                runtimeError(TOO_FEW_ARGS, "Expecting 3 args", in, currentInstruction);
+            }
+            if (in->args.length > 3) {
+                runtimeError(TOO_MANY_ARGS, "Expecting 3 args", in, currentInstruction);
+            }
+            if (in->args.args[0].type != VALUE) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting an Object for arg 1", in, currentInstruction);
+            }
+            if (in->args.args[0].value.value.type != CUSTOM) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting an Object for arg 1", in, currentInstruction);
+            }
+            if (in->args.args[1].type != DIRREF) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 2", in, currentInstruction);
+            }
+            if (in->args.args[2].type != DIRREF) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 3", in, currentInstruction);
+            }
+
+            GroundObjectField* field = findField(*in->args.args[0].value.value.data.customVal, in->args.args[1].value.refName);
+            if (field == NULL) {
+                runtimeError(UNKNOWN_VARIABLE, "Struct does not contain that field", in, currentInstruction);
+            }
+            addVariable(scope->variables, in->args.args[2].value.refName, field->value);
+            
+            break;
+        }
+        // setfield &obj &field $value
+        case SETFIELD: {
+            if (in->args.length < 3) {
+                runtimeError(TOO_FEW_ARGS, "Expecting 3 args", in, currentInstruction);
+            }
+            if (in->args.length > 3) {
+                runtimeError(TOO_MANY_ARGS, "Expecting 3 args", in, currentInstruction);
+            }
+            if (in->args.args[0].type != DIRREF) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef to an Object for arg 1", in, currentInstruction);
+            }
+            if (in->args.args[1].type != DIRREF) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef for arg 2", in, currentInstruction);
+            }
+            if (in->args.args[2].type != VALUE) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a Value for arg 3", in, currentInstruction);
+            }
+
+            GroundVariable* var = findVariable(*scope->variables, in->args.args[0].value.refName);
+            if (var == NULL) {
+                runtimeError(UNKNOWN_VARIABLE, "Could not find that object", in, currentInstruction);
+            }
+            if (var->value.type != CUSTOM) {
+                runtimeError(ARG_TYPE_MISMATCH, "Expecting a DirectRef to an Object for arg 1", in, currentInstruction);
+            }
+
+            GroundObjectField* field = findField(*var->value.data.customVal, in->args.args[1].value.refName);
+            if (field == NULL) {
+                runtimeError(UNKNOWN_VARIABLE, "Struct does not contain that field", in, currentInstruction);
+            }
+            if (field->value.type != in->args.args[2].value.value.type) {
+                runtimeError(ARG_TYPE_MISMATCH, "Field type and provided type do not match", in, currentInstruction);
+            }
+
+            field->value = copyGroundValue(&in->args.args[2].value.value);
+            break;
+        }
+
         case DROP: {
             if (in->args.length < 1) {
                 runtimeError(TOO_FEW_ARGS, "Expecting 1 arg", in, currentInstruction);
diff --git a/src/parser.c b/src/parser.c
index 57a3395..59a2b29 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -168,6 +168,8 @@ static GroundInstType getInstructionType(const char* inst) {
     if (strcmp(inst, "struct") == 0) return STRUCT;
     if (strcmp(inst, "endstruct") == 0) return ENDSTRUCT;
     if (strcmp(inst, "init") == 0) return INIT;
+    if (strcmp(inst, "getfield") == 0) return GETFIELD;
+    if (strcmp(inst, "setfield") == 0) return SETFIELD;
     if (strcmp(inst, "use") == 0) return USE;
     if (strcmp(inst, "extern") == 0) return EXTERN;
     if (strcmp(inst, "drop") == 0) return DROP;
diff --git a/src/types.h b/src/types.h
index 5085cd5..600322c 100644
--- a/src/types.h
+++ b/src/types.h
@@ -9,7 +9,7 @@
 #include "include/uthash.h"
 
 typedef enum GroundInstType {
-    IF, JUMP, END, INPUT, PRINT, PRINTLN, SET, GETTYPE, EXISTS, SETLIST, SETLISTAT, GETLISTAT, GETLISTSIZE, LISTAPPEND, GETSTRSIZE, GETSTRCHARAT, ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, INEQUAL, NOT, GREATER, LESSER, STOI, STOD, TOSTRING, FUN, RETURN, ENDFUN, PUSHARG, CALL, STRUCT, ENDSTRUCT, INIT, USE, EXTERN, CREATELABEL, PAUSE, DROP, ERRORCMD
+    IF, JUMP, END, INPUT, PRINT, PRINTLN, SET, GETTYPE, EXISTS, SETLIST, SETLISTAT, GETLISTAT, GETLISTSIZE, LISTAPPEND, GETSTRSIZE, GETSTRCHARAT, ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, INEQUAL, NOT, GREATER, LESSER, STOI, STOD, TOSTRING, FUN, RETURN, ENDFUN, PUSHARG, CALL, STRUCT, ENDSTRUCT, INIT, GETFIELD, SETFIELD, USE, EXTERN, CREATELABEL, PAUSE, DROP, ERRORCMD
 } GroundInstType;
 
 typedef enum GroundValueType {
diff --git a/tests/struct.grnd b/tests/struct.grnd
new file mode 100644
index 0000000..852b4e7
--- /dev/null
+++ b/tests/struct.grnd
@@ -0,0 +1,17 @@
+struct -point
+
+    init &x -int
+    init &y -int
+
+endstruct
+
+init &mypoint -point
+
+setfield &mypoint &x 53
+setfield &mypoint &y 32
+
+getfield $mypoint &x &value
+println $value
+
+getfield $mypoint &y &value
+println $value