diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a5d8f72
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+bin/
+dist/
diff --git a/cmd/cli/main.go b/cmd/cli/main.go
new file mode 100644
index 0000000..249ceba
--- /dev/null
+++ b/cmd/cli/main.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	"git.tuxpa.in/a/card_id/common/game"
+)
+
+func main() {
+	g, err := game.NewFromRoot(os.Getenv("CARD_DATA_DIR"))
+	if err != nil {
+		log.Panicln(err)
+	}
+
+	log.Println(g.RandomLevel().RandomTable().RandomResult())
+
+}
diff --git a/common/data/grades.go b/common/data/grades.go
new file mode 100644
index 0000000..4a263ca
--- /dev/null
+++ b/common/data/grades.go
@@ -0,0 +1,31 @@
+package data
+
+import (
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Grades []Grade
+
+type Grade struct {
+	Grade        int     `yaml:"Grade"`
+	Rate         float64 `yaml:"Rate0"`
+	SpecialTable int     `yaml:"Special_Table"`
+	SpecialRate  float64 `yaml:"Special_Rate"`
+}
+
+func NewGradesFromFile(path string) (Grades, error) {
+	out := []Grade{}
+	bts, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(bts, &out)
+	if err != nil {
+		return nil, err
+	}
+
+	return out, nil
+}
diff --git a/common/data/result.go b/common/data/result.go
new file mode 100644
index 0000000..296ed25
--- /dev/null
+++ b/common/data/result.go
@@ -0,0 +1,30 @@
+package data
+
+import (
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Results []Result
+
+type Result struct {
+	Itemid int     `yaml:"Itemid"`
+	Name   string  `yaml:"Name"`
+	Rate   float64 `yaml:"Rate"`
+}
+
+func NewResultsFromFile(path string) (Results, error) {
+	out := []Result{}
+	bts, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	err = yaml.Unmarshal(bts, &out)
+	if err != nil {
+		return nil, err
+	}
+
+	return out, nil
+}
diff --git a/common/game/game.go b/common/game/game.go
new file mode 100644
index 0000000..36af49c
--- /dev/null
+++ b/common/game/game.go
@@ -0,0 +1,68 @@
+package game
+
+import (
+	"log"
+	"path"
+	"strconv"
+
+	"git.tuxpa.in/a/card_id/common/data"
+	"git.tuxpa.in/a/card_id/common/game/level"
+	"git.tuxpa.in/a/card_id/common/game/table"
+	"lukechampine.com/frand"
+)
+
+type Game struct {
+	Levels           map[string]*level.Level
+	TotalProbability float64
+}
+
+func NewFromRoot(datadir string) (*Game, error) {
+	out := &Game{
+		Levels: make(map[string]*level.Level, 12),
+	}
+	if datadir == "" {
+		datadir = "./data"
+	}
+	grades, err := data.NewGradesFromFile(path.Join(datadir, "GradeInfo.yaml"))
+	if err != nil {
+		return nil, err
+	}
+	for _, v := range grades {
+		lvl := &level.Level{}
+		lvl.Name = strconv.Itoa(v.Grade)
+		out.Levels[lvl.Name] = lvl
+		lvl.SelectionWeight = v.Rate
+		out.TotalProbability = out.TotalProbability + v.Rate
+
+		rres, err := data.NewResultsFromFile(path.Join(datadir, "ResultTable", lvl.Name+".yaml"))
+		if err != nil {
+			return nil, err
+		}
+		lvl.RewardTable = table.New(rres)
+		if v.SpecialRate > 0 {
+			lvl.SpecialChance = v.SpecialRate
+			sres, err := data.NewResultsFromFile(path.Join(datadir, "SpecialTable", lvl.Name+".yaml"))
+			if err != nil {
+				return nil, err
+			}
+			lvl.SpecialTable = table.New(sres)
+		}
+	}
+	return out, nil
+}
+
+func (g *Game) RandomLevel() *level.Level {
+	selector := frand.Float64() * g.TotalProbability
+	sofar := 0.0
+	if len(g.Levels) == 0 {
+		return nil
+	}
+	for _, v := range g.Levels {
+		sofar = sofar + v.SelectionWeight
+		if sofar >= selector-0.000000001 {
+			return v
+		}
+	}
+	log.Println("BAD BAD BAD BAD BAD BAD PLEASE REPORT OH NO OH NO OH FISJAFIJNSAF")
+	return g.RandomLevel()
+}
diff --git a/common/game/level/level.go b/common/game/level/level.go
new file mode 100644
index 0000000..5691131
--- /dev/null
+++ b/common/game/level/level.go
@@ -0,0 +1,25 @@
+package level
+
+import (
+	"git.tuxpa.in/a/card_id/common/game/table"
+	"lukechampine.com/frand"
+)
+
+type Level struct {
+	Name string
+
+	SelectionWeight float64
+	RewardTable     *table.Table
+	SpecialTable    *table.Table
+	SpecialChance   float64
+}
+
+func (l *Level) RandomTable() *table.Table {
+	if l.SpecialChance == 0 {
+		return l.RewardTable
+	}
+	if l.SpecialChance > (frand.Float64() * 100) {
+		return l.SpecialTable
+	}
+	return l.RewardTable
+}
diff --git a/common/game/table/table.go b/common/game/table/table.go
new file mode 100644
index 0000000..841b980
--- /dev/null
+++ b/common/game/table/table.go
@@ -0,0 +1,42 @@
+package table
+
+import (
+	"fmt"
+
+	"git.tuxpa.in/a/card_id/common/data"
+	"lukechampine.com/frand"
+)
+
+// a table is a collection of results
+
+type Table struct {
+	raw data.Results
+
+	TotalProbability float64
+}
+
+func New(r data.Results) *Table {
+	out := &Table{}
+	out.raw = r
+
+	for _, v := range out.raw {
+		out.TotalProbability = out.TotalProbability + v.Rate
+	}
+
+	return out
+}
+
+func (t *Table) RandomResult() data.Result {
+	selector := frand.Float64() * t.TotalProbability
+	sofar := 0.0
+	for _, v := range t.raw {
+		sofar = sofar + v.Rate
+		if sofar >= selector-0.000000001 {
+			return v
+		}
+	}
+	return data.Result{
+		Name: fmt.Sprintf("please report this bug: %v", selector),
+		Rate: selector,
+	}
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..8a4f0d7
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,11 @@
+module git.tuxpa.in/a/card_id
+
+go 1.18
+
+require gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
+
+require (
+	github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da // indirect
+	golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb // indirect
+	lukechampine.com/frand v1.4.2 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..a10dd4e
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,10 @@
+github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
+github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
+golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb h1:fgwFCsaw9buMuxNd6+DQfAuSFqbNiQZpcgJQAgJsK6k=
+golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+lukechampine.com/frand v1.4.2 h1:RzFIpOvkMXuPMBb9maa4ND4wjBn71E1Jpf8BzJHMaVw=
+lukechampine.com/frand v1.4.2/go.mod h1:4S/TM2ZgrKejMcKMbeLjISpJMO+/eZ1zu3vYX9dtj3s=