diff --git a/kadai3-1/akuchii/game/game.go b/kadai3-1/akuchii/game/game.go
new file mode 100644
index 0000000..590241d
--- /dev/null
+++ b/kadai3-1/akuchii/game/game.go
@@ -0,0 +1,75 @@
+package game
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"math/rand"
+	"time"
+)
+
+// Game generates typing game
+type Game struct {
+	reader  io.Reader
+	writer  io.Writer
+	idx     int
+	words   []string
+	timeout time.Duration
+}
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+// NewGame generates new Game instance
+func NewGame(r io.Reader, w io.Writer, words []string, timeout time.Duration) *Game {
+	return &Game{reader: r, writer: w, words: words, timeout: timeout}
+}
+
+// Start starts typing game
+func (g Game) Start() int {
+	ctx := context.Background()
+	ctx, cancel := context.WithTimeout(ctx, g.timeout)
+	defer cancel()
+
+	ch := input(g.reader)
+	cnt := 0
+LOOP:
+	for {
+		g.setNewIdx()
+		fmt.Fprintln(g.writer, "> "+g.word())
+		select {
+		case v := <-ch:
+			if v == g.word() {
+				cnt++
+				fmt.Fprintln(g.writer, "correct!")
+			} else {
+				fmt.Fprintln(g.writer, "incorrect!")
+			}
+		case <-ctx.Done():
+			break LOOP
+		}
+	}
+	return cnt
+}
+
+func (g *Game) setNewIdx() {
+	g.idx = rand.Intn(len(g.words))
+}
+
+func (g Game) word() string {
+	return g.words[g.idx]
+}
+
+func input(r io.Reader) <-chan string {
+	ch := make(chan string)
+	go func() {
+		s := bufio.NewScanner(r)
+		for s.Scan() {
+			ch <- s.Text()
+		}
+		close(ch)
+	}()
+	return ch
+}
diff --git a/kadai3-1/akuchii/main.go b/kadai3-1/akuchii/main.go
new file mode 100644
index 0000000..f57ca0a
--- /dev/null
+++ b/kadai3-1/akuchii/main.go
@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/gopherdojo/dojo4/kadai3-1/akuchii/game"
+)
+
+func main() {
+	timeout := 5 * time.Second
+	game := game.NewGame(os.Stdin, os.Stdout, getWords(), timeout)
+	cnt := game.Start()
+	fmt.Printf("\nfinish!\ncorrect count is %d\n", cnt)
+	os.Exit(0)
+}
+
+func getWords() []string {
+	return []string{"csharp", "python", "perl", "cplusplus", "ruby", "golang", "scala"}
+}
diff --git a/kadai3-2/akuchii/downloader/downloader.go b/kadai3-2/akuchii/downloader/downloader.go
new file mode 100644
index 0000000..cc7969f
--- /dev/null
+++ b/kadai3-2/akuchii/downloader/downloader.go
@@ -0,0 +1,135 @@
+package downloader
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+
+	"golang.org/x/sync/errgroup"
+)
+
+// Downloader downloads data in parallel
+type Downloader struct {
+	url      string
+	fileSize uint
+	splitNum uint
+	fileName string
+}
+
+// Range defines range of data of start and end
+type Range struct {
+	start uint
+	end   uint
+	idx   uint
+}
+
+// NewDownloader generate new Downloader instance
+func NewDownloader(url string, splitNum uint) *Downloader {
+	return &Downloader{
+		url:      url,
+		splitNum: splitNum,
+	}
+}
+
+// Prepare prepares for download in parallel
+func (d *Downloader) Prepare() error {
+	res, err := http.Head(d.url)
+	if err != nil {
+		return err
+	}
+	d.fileSize = uint(res.ContentLength)
+
+	elems := strings.Split(d.url, "/")
+	d.fileName = elems[len(elems)-1]
+
+	return nil
+}
+
+// Download downloads in parallel
+func (d Downloader) Download() error {
+	var eg errgroup.Group
+
+	for i := uint(0); i < d.splitNum; i++ {
+		r := d.makeRange(i)
+		eg.Go(func() error {
+			return d.request(r)
+		})
+	}
+	if err := eg.Wait(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// GetFileName gets name of download file
+func (d Downloader) GetFileName() string {
+	return d.fileName
+}
+
+// MergeFiles merges files downloads in parallel
+func (d Downloader) MergeFiles() error {
+	f, err := os.Create(d.fileName)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	for i := uint(0); i < d.splitNum; i++ {
+		tmpFileName := fmt.Sprintf("%s.%d", d.fileName, i)
+		tmpFile, err := os.Open(tmpFileName)
+		if err != nil {
+			return err
+		}
+		io.Copy(f, tmpFile)
+		tmpFile.Close()
+		if err := os.Remove(tmpFileName); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (d Downloader) request(r Range) error {
+	req, err := http.NewRequest(http.MethodGet, d.url, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", r.start, r.end))
+	client := new(http.Client)
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	tmpFileName := fmt.Sprintf("%s.%d", d.fileName, r.idx)
+	file, err := os.Create(tmpFileName)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	if _, err := io.Copy(file, resp.Body); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (d Downloader) makeRange(i uint) Range {
+	splitSize := d.fileSize / d.splitNum
+	start := i * splitSize
+	end := (i+1)*splitSize - 1
+
+	if i == d.splitNum {
+		end = d.fileSize
+	}
+
+	return Range{
+		start: start,
+		end:   end,
+		idx:   i,
+	}
+}
diff --git a/kadai3-2/akuchii/main.go b/kadai3-2/akuchii/main.go
new file mode 100644
index 0000000..bc1fde2
--- /dev/null
+++ b/kadai3-2/akuchii/main.go
@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/gopherdojo/dojo4/kadai3-2/akuchii/downloader"
+)
+
+func main() {
+	if len(os.Args) != 2 {
+		fmt.Println("require url")
+		os.Exit(1)
+	}
+
+	var splitNum uint = 4
+	url := os.Args[1]
+	d := downloader.NewDownloader(url, splitNum)
+
+	if err := d.Prepare(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	if err := d.Download(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	if err := d.MergeFiles(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	fmt.Printf("download complete! : %v\n", d.GetFileName())
+	os.Exit(0)
+}