diff --git a/src/day4/day4.go b/src/day4/day4.go
new file mode 100644
index 0000000..73ba299
--- /dev/null
+++ b/src/day4/day4.go
@@ -0,0 +1,157 @@
+package main
+
+import (
+	"AOC2021/src/helper"
+	"fmt"
+	"os"
+	"strings"
+)
+
+type bingoField struct {
+	number int
+	checked bool
+}
+
+type bingoGame struct {
+	winState []int
+	currentRound int
+	numbers []int
+	boards [][][]bingoField
+}
+
+func main() {
+	args := os.Args[1:]
+	input, err := helper.GetInput(args[0])
+	if err != nil {
+		fmt.Println(err)
+	}
+	bingoNumbers, _ := helper.MapToNumber(strings.Split(input[0], ","))
+	bingoBoards := parseBoards(input)
+
+	part1(bingoNumbers, bingoBoards)
+	part2(bingoNumbers, bingoBoards)
+}
+
+func part1(bingoNumbers []int, bingoBoards [][][]bingoField) {
+	game := bingoGame{[]int{}, 0, bingoNumbers, bingoBoards}
+	for len(game.winState) == 0 {
+		game.playRound()
+	}
+	fmt.Println(getSumOfUncheckedField(game.boards[game.winState[0]]) * game.numbers[game.currentRound-1])
+}
+
+func part2(bingoNumbers []int, bingoBoards [][][]bingoField) {
+	game := bingoGame{[]int{}, 0, bingoNumbers, bingoBoards}
+	for len(game.winState) < len(game.boards) {
+		game.playRound()
+	}
+	fmt.Println(getSumOfUncheckedField(game.boards[game.winState[len(game.winState)-1]]) * game.numbers[game.currentRound-1])
+}
+
+func parseBoards(input []string) [][][]bingoField {
+	var bingoBoards [][][]bingoField
+	for i := 0; i*6 + 6 <= len(input); i++ {
+		begin := 2 + i*6
+		end := 7 + i*6
+		bingoBoards = append(bingoBoards,parseBoard(input[begin:end]) )
+	}
+	return bingoBoards
+}
+
+func parseBoard(input []string) [][]bingoField{
+	bingoBoard := make([][]bingoField, len(input))
+	for i, line := range input {
+		numberStrings := strings.Split(line, " ")
+		numberStrings = helper.Delete(numberStrings, "")
+		numbers, _ := helper.MapToNumber(numberStrings)
+		row := make([]bingoField, len(numbers))
+		for i, number := range numbers {
+			row[i] = bingoField{number, false}
+		}
+		bingoBoard[i] = row
+	}
+	return bingoBoard
+}
+
+func (game* bingoGame) playRound () {
+	drawnNumber := game.numbers[game.currentRound]
+	for _, board := range game.boards {
+		markFields(&board, drawnNumber)
+	}
+	for i, board := range game.boards {
+		if !helper.Contains(i, game.winState) && checkWinCondition(board){
+			game.winState = append(game.winState, i)
+		}
+	}
+	game.currentRound++
+}
+
+func markFields(board *[][]bingoField, drawnNumber int) {
+	for i,row := range *board {
+		for j,field := range row {
+			if field.number == drawnNumber {
+				(*board)[i][j] = bingoField{drawnNumber, true}
+			}
+		}
+	}
+}
+
+func checkWinCondition(board [][]bingoField) bool{
+	winConditionBoard := make([][]int, len(board))
+	for i,row := range board {
+		for _,field := range row {
+			if field.checked {
+				winConditionBoard[i] = append(winConditionBoard[i], 1)
+			} else {
+				winConditionBoard[i] = append(winConditionBoard[i], 0)
+			}
+		}
+	}
+	if checkWinConditionRows(winConditionBoard) || checkWinConditionRows(helper.Transpose(winConditionBoard))  {
+		return true
+	}
+	return false
+}
+
+func checkWinConditionRows(rows [][]int) bool{
+	for _, row := range rows {
+		if helper.AddNummbers(row...) == len(row) {
+			return true
+		}
+	}
+	return false
+}
+
+func checkWinConditionDiagonals(rows [][]int) bool{
+	return checkWinConditionDiagonal(rows) || checkWinConditionDiagonalInverse(rows)
+}
+
+func checkWinConditionDiagonal(rows [][]int,) bool {
+	for i := 0; i < len(rows); i++ {
+		if rows[i][i] == 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func checkWinConditionDiagonalInverse(rows [][]int) bool {
+	for i := 0; i < len(rows); i++ {
+		if rows[4-i][i] == 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func getSumOfUncheckedField(board [][]bingoField) int {
+	sum := 0
+	for _, row := range board {
+		for _, field := range row {
+			if !field.checked {
+				sum += field.number
+			}
+		}
+	}
+	return sum
+}
\ No newline at end of file
diff --git a/src/day4/day4Input.txt b/src/day4/day4Input.txt
new file mode 100644
index 0000000..23a4775
--- /dev/null
+++ b/src/day4/day4Input.txt
@@ -0,0 +1,601 @@
+76,69,38,62,33,48,81,2,64,21,80,90,29,99,37,15,93,46,75,0,89,56,58,40,92,47,8,6,54,96,12,66,83,4,70,19,17,5,50,52,45,51,18,27,49,71,28,86,74,77,11,20,84,72,23,31,16,78,91,65,87,79,73,94,24,68,63,9,88,82,30,42,60,13,67,85,44,59,7,53,22,1,26,41,61,55,43,39,3,35,25,34,57,10,14,32,97,95,36,98
+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
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+
+14 92  7 98 12
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+
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+61 31 41  9 66
+
+43 67 52 92 54
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+19  0 88 61  2
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+89 23 25  4 24
+
+41 62  7 66 33
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+
+92 89 50 11 73
+41 48 62 80 78
+46 55 81 16 94
+97 45  5 13 40
+14 75 22 42  2
\ No newline at end of file
diff --git a/src/day4/day4Test.txt b/src/day4/day4Test.txt
new file mode 100644
index 0000000..49d17bc
--- /dev/null
+++ b/src/day4/day4Test.txt
@@ -0,0 +1,19 @@
+7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
\ No newline at end of file
diff --git a/src/helper/helper.go b/src/helper/helper.go
index 1f0a4bd..99c6608 100644
--- a/src/helper/helper.go
+++ b/src/helper/helper.go
@@ -27,10 +27,11 @@ func GetFile(filename string) (string, error) {
 	return string(content), err
 }
 
-func MapToNumber(strings []string) ([]int, error) {
+func MapToNumber(numberStrings []string) ([]int, error) {
 	var numbers []int
-	for _, line := range strings {
-		number, err := strconv.Atoi(line)
+	for _, numberString := range numberStrings {
+		trimmedNumberString := strings.TrimSpace(numberString)
+		number, err := strconv.Atoi(trimmedNumberString)
 		if err != nil {
 			return numbers, err
 		}
@@ -119,3 +120,13 @@ func Transpose(in [][]int) [][]int {
 	}
 	return out
 }
+
+func Delete (stringArray []string, selector string) []string {
+	var returnString []string
+	for _, str := range stringArray {
+		if str != selector {
+			returnString = append(returnString, str)
+		}
+	}
+	return returnString
+}