diff --git a/day_10/Makefile b/day_10/Makefile
new file mode 100644
index 0000000..6eb5dcf
--- /dev/null
+++ b/day_10/Makefile
@@ -0,0 +1,3 @@
+TARGET := day_10
+
+include ../Makefile.common.mk
diff --git a/day_10/input.txt b/day_10/input.txt
new file mode 100644
index 0000000..04aee45
--- /dev/null
+++ b/day_10/input.txt
@@ -0,0 +1,141 @@
+addx 1
+noop
+addx 5
+addx -1
+addx 5
+addx 1
+noop
+noop
+addx 2
+addx 5
+addx 2
+addx 1
+noop
+addx -21
+addx 26
+addx -6
+addx 8
+noop
+noop
+addx 7
+noop
+noop
+noop
+addx -37
+addx 13
+addx -6
+addx -2
+addx 5
+addx 25
+addx 2
+addx -24
+addx 2
+addx 5
+addx 5
+noop
+noop
+addx -2
+addx 2
+addx 5
+addx 2
+addx 7
+addx -2
+noop
+addx -8
+addx 9
+addx -36
+noop
+noop
+addx 5
+addx 6
+noop
+addx 25
+addx -24
+addx 3
+addx -2
+noop
+addx 3
+addx 6
+noop
+addx 9
+addx -8
+addx 5
+addx 2
+addx -7
+noop
+addx 12
+addx -10
+addx 11
+addx -38
+addx 22
+addx -15
+addx -3
+noop
+addx 32
+addx -25
+addx -7
+addx 11
+addx 5
+addx 10
+addx -9
+addx 17
+addx -12
+addx 2
+noop
+addx 2
+addx -15
+addx 22
+noop
+noop
+noop
+addx -35
+addx 7
+addx 21
+addx -25
+noop
+addx 3
+addx 2
+noop
+addx 7
+noop
+addx 3
+noop
+addx 2
+addx 9
+addx -4
+addx -2
+addx 5
+addx 2
+addx -2
+noop
+addx 7
+addx 2
+addx -39
+addx 2
+noop
+addx 1
+noop
+addx 5
+addx 24
+addx -20
+addx 1
+addx 5
+noop
+noop
+addx 4
+noop
+addx 1
+noop
+addx 4
+addx 3
+noop
+addx 2
+noop
+noop
+addx 1
+addx 2
+noop
+addx 3
+noop
+noop
+
diff --git a/day_10/lexer.l b/day_10/lexer.l
new file mode 100644
index 0000000..875b8ac
--- /dev/null
+++ b/day_10/lexer.l
@@ -0,0 +1,51 @@
+%{
+#include <stdio.h>
+#include <stdlib.h>
+#include "parser.h"
+
+%}
+
+%option warn nodefault
+
+/* makes the scanner terminate after reaching <<EOF>> instead of assuming a new input was provided */
+%option noyywrap
+/* disable some unused functionality, add scanner tracking */
+%option nounput noinput batch debug
+
+/* gimme a reentrant parser (overkill but more pure) */
+%option reentrant
+
+%option bison-bridge
+
+
+NL                  [\n]
+SPACE               " "
+
+NOP                 "noop"
+ADD                 "addx"
+
+/*general definitions*/
+NUM                 [0-9\-]
+
+%%
+
+{NL}                { return NEWLINE; }
+{SPACE}             { /* return SPACE; */ }
+{NOP}               { return NOP; }
+{ADD}               { return ADDX; }
+
+{NUM}+              {
+                        int num = atoi(yytext);
+                        yylval->num = num;
+                        return NUM;
+                    }
+
+<<EOF>>             {
+                        return END_OF_FILE;
+                    }
+.                   {
+                        printf("[error] Encountered unexpected token %s\n", yytext);
+                        return 0;
+                    }
+
+%%
diff --git a/day_10/parser.y b/day_10/parser.y
new file mode 100644
index 0000000..9fd9093
--- /dev/null
+++ b/day_10/parser.y
@@ -0,0 +1,132 @@
+/* Require bison minimal version */
+%require "3.2"
+
+/* write out a header file containing the token defines */
+%header
+
+// Code for the header file generated by bison
+%code requires {
+    #include <stdbool.h>
+
+    typedef void* yyscan_t;
+
+    struct parser_state {
+        /// Program Counter
+        size_t cycle;
+
+        /// Contents of register X
+        long reg;
+
+        /// Task 1
+        long sum;
+        size_t next_target_cycle;
+    };
+}
+
+// Code for the c file
+%{
+    #include <stdio.h>
+    #include <stdlib.h>
+    #include "parser.h"
+    #include "lexer.h"
+
+    void yyerror(struct parser_state* state, yyscan_t scanner, const char* msg) {
+        (void)state;
+        (void)scanner;
+        fprintf(stderr, "\033[93mSyntax Error: %s\033[0m\n", msg);
+    }
+
+    void increment_cycle(struct parser_state *state) {
+        state->cycle++;
+
+        if (state->cycle == state->next_target_cycle) {
+            long tmp = state->cycle * state->reg;
+            printf("[info] Register contents at cycle %zu: %ld\n", state->cycle, state->reg);
+            state->sum += tmp;
+
+            if (state->next_target_cycle < 220) {
+                state->next_target_cycle += 40;
+            }
+        }
+    }
+%}
+
+// define a reentrant parser
+%define api.pure
+
+// enable parser tracing and detailed error messages (plus Lookahead Correction)
+%define parse.trace
+%define parse.error detailed
+%define parse.lac full
+
+%lex-param   { yyscan_t scanner }
+%parse-param { struct parser_state* state }
+%parse-param { yyscan_t scanner }
+
+%union {
+    int num;
+}
+
+%start input
+%token NEWLINE
+%token NOP ADDX
+%token <num> NUM
+%term END_OF_FILE
+
+%%
+
+input
+    : line input
+    | END_OF_FILE   { return 0; }
+    ;
+
+line
+    : instruction NEWLINE
+    | NEWLINE
+    ;
+
+instruction
+    : NOP       { increment_cycle(state); }
+    | ADDX NUM  {
+                    increment_cycle(state);
+                    increment_cycle(state);
+
+                    state->reg += $2;
+                }
+    ;
+
+
+%%
+
+
+int main(void) {
+    struct parser_state *state = calloc(1, sizeof(struct parser_state));
+    if (!state) {
+        fprintf(stderr, "\033[91m[error] Ran out of memory\033[0m\n");
+        return EXIT_FAILURE;
+    }
+
+    state->reg = 1;
+    state->next_target_cycle = 20;
+
+    yyscan_t scanner;
+    if (yylex_init(&scanner)) {
+        fprintf(stderr, "\033[91m[error] Could not initialize lexer\033[0m\n");
+        return EXIT_FAILURE;
+    }
+
+    if (yyparse(state, scanner)) {
+		// TODO: Error handling https://www.gnu.org/software/bison/manual/html_node/Parser-Function.html
+		// error during parse occured
+		return EXIT_FAILURE;
+	}
+
+    yylex_destroy(scanner);
+
+    // task 1
+    printf("Sum of signal strengths: %ld\n", state->sum);
+
+    free(state);
+
+    return 0;
+}