diff --git a/day02/Makefile b/day02/Makefile
new file mode 100644
index 0000000..2c36b19
--- /dev/null
+++ b/day02/Makefile
@@ -0,0 +1,245 @@
+#---------------------------------------------------------------------------------
+.SUFFIXES:
+#---------------------------------------------------------------------------------
+
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+TOPDIR ?= $(CURDIR)
+include $(DEVKITARM)/3ds_rules
+
+#---------------------------------------------------------------------------------
+# TARGET is the name of the output
+# BUILD is the directory where object files & intermediate files will be placed
+# SOURCES is a list of directories containing source code
+# DATA is a list of directories containing data files
+# INCLUDES is a list of directories containing header files
+# GRAPHICS is a list of directories containing graphics files
+# GFXBUILD is the directory where converted graphics files will be placed
+#   If set to $(BUILD), it will statically link in the converted
+#   files as if they were data files.
+#
+# NO_SMDH: if set to anything, no SMDH file is generated.
+# ROMFS is the directory which contains the RomFS, relative to the Makefile (Optional)
+# APP_TITLE is the name of the app stored in the SMDH file (Optional)
+# APP_DESCRIPTION is the description of the app stored in the SMDH file (Optional)
+# APP_AUTHOR is the author of the app stored in the SMDH file (Optional)
+# ICON is the filename of the icon (.png), relative to the project folder.
+#   If not set, it attempts to use one of the following (in this order):
+#     - <Project name>.png
+#     - icon.png
+#     - <libctru folder>/default_icon.png
+#---------------------------------------------------------------------------------
+TARGET		:=	$(notdir $(CURDIR))
+BUILD		:=	build
+SOURCES		:=	source
+DATA		:=	data
+INCLUDES	:=	include
+GRAPHICS	:=	gfx
+GFXBUILD	:=	$(BUILD)
+#ROMFS		:=	romfs
+#GFXBUILD	:=	$(ROMFS)/gfx
+APP_TITLE   := day02
+APP_DESCRIPTION := aoc 2025
+APP_AUTHOR  := Candy
+
+#---------------------------------------------------------------------------------
+# options for code generation
+#---------------------------------------------------------------------------------
+ARCH	:=	-march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft
+
+# There used to be -mword-allocations here but swiftc doesn't like it
+# I removed it and it works but may break something later...
+CFLAGS	:=	-g -Wall -O2 \
+			-ffunction-sections \
+			$(ARCH)
+
+CFLAGS	+=	$(INCLUDE) -D__3DS__
+
+CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
+
+ASFLAGS	:=	-g $(ARCH)
+LDFLAGS	=	-specs=3dsx.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map) -L../../Shared/lib
+LIBS	:= -lctru -lm -lShared
+
+#---------------------------------------------------------------------------------
+# list of directories containing libraries, this must be the top level containing
+# include and lib
+#---------------------------------------------------------------------------------
+LIBDIRS	:= $(CTRULIB)
+
+#---------------------------------------------------------------------------------
+# swift-specific bits
+#---------------------------------------------------------------------------------
+SWIFTC := ~/.local/share/swiftly/bin/swiftc
+SWIFTFLAGS := -wmo -parse-as-library -enable-experimental-feature Embedded \
+			  -target armv6-none-none-eabi -import-objc-header ../$(INCLUDES)/BridgingHeader.h \
+			  -I $(DEVKITPRO)/devkitARM/include -I $(DEVKITPRO)/devkitARM/arm-none-eabi/include -Ounchecked
+%.o: %.swift
+	@echo $(notdir $<)
+	$(ADD_COMPILE_COMMAND) add $(SWIFTC) $(SWIFTFLAGS) "$(addprefix -Xcc , $(C_FLAGS)) -c $< -o $@" $<
+	$(SILENTCMD)$(SWIFTC) $(SWIFTFLAGS) $(addprefix -Xcc , $(CFLAGS)) -c $< -o $@ $(ERROR_FILTER)
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export OUTPUT	:=	$(CURDIR)/$(TARGET)
+export TOPDIR	:=	$(CURDIR)
+
+export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
+			$(foreach dir,$(GRAPHICS),$(CURDIR)/$(dir)) \
+			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
+
+export DEPSDIR	:=	$(CURDIR)/$(BUILD)
+
+CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
+CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
+SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+SWIFTFILES  := 	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.swift)))
+PICAFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.v.pica)))
+SHLISTFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.shlist)))
+GFXFILES	:=	$(foreach dir,$(GRAPHICS),$(notdir $(wildcard $(dir)/*.t3s)))
+BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+#---------------------------------------------------------------------------------
+ifeq ($(GFXBUILD),$(BUILD))
+#---------------------------------------------------------------------------------
+export T3XFILES :=  $(GFXFILES:.t3s=.t3x)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+export ROMFS_T3XFILES	:=	$(patsubst %.t3s, $(GFXBUILD)/%.t3x, $(GFXFILES))
+export T3XHFILES		:=	$(patsubst %.t3s, $(BUILD)/%.h, $(GFXFILES))
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES_SOURCES 	:=	$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o) $(SWIFTFILES:.swift=.o)
+
+export OFILES_BIN	:=	$(addsuffix .o,$(BINFILES)) \
+			$(PICAFILES:.v.pica=.shbin.o) $(SHLISTFILES:.shlist=.shbin.o) \
+			$(addsuffix .o,$(T3XFILES))
+
+export OFILES := $(OFILES_BIN) $(OFILES_SOURCES)
+
+export HFILES	:=	$(PICAFILES:.v.pica=_shbin.h) $(SHLISTFILES:.shlist=_shbin.h) \
+			$(addsuffix .h,$(subst .,_,$(BINFILES))) \
+			$(GFXFILES:.t3s=.h)
+
+export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+			-I$(CURDIR)/$(BUILD)
+
+export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+export _3DSXDEPS	:=	$(if $(NO_SMDH),,$(OUTPUT).smdh)
+
+ifeq ($(strip $(ICON)),)
+	icons := $(wildcard *.png)
+	ifneq (,$(findstring $(TARGET).png,$(icons)))
+		export APP_ICON := $(TOPDIR)/$(TARGET).png
+	else
+		ifneq (,$(findstring icon.png,$(icons)))
+			export APP_ICON := $(TOPDIR)/icon.png
+		endif
+	endif
+else
+	export APP_ICON := $(TOPDIR)/$(ICON)
+endif
+
+ifeq ($(strip $(NO_SMDH)),)
+	export _3DSXFLAGS += --smdh=$(CURDIR)/$(TARGET).smdh
+endif
+
+ifneq ($(ROMFS),)
+	export _3DSXFLAGS += --romfs=$(CURDIR)/$(ROMFS)
+endif
+
+.PHONY: all clean
+
+#---------------------------------------------------------------------------------
+all: $(BUILD) $(GFXBUILD) $(DEPSDIR) $(ROMFS_T3XFILES) $(T3XHFILES)
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+$(BUILD):
+	@mkdir -p $@
+
+ifneq ($(GFXBUILD),$(BUILD))
+$(GFXBUILD):
+	@mkdir -p $@
+endif
+
+ifneq ($(DEPSDIR),$(BUILD))
+$(DEPSDIR):
+	@mkdir -p $@
+endif
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) $(TARGET).3dsx $(OUTPUT).smdh $(TARGET).elf $(GFXBUILD)
+
+#---------------------------------------------------------------------------------
+$(GFXBUILD)/%.t3x	$(BUILD)/%.h	:	%.t3s
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@tex3ds -i $< -H $(BUILD)/$*.h -d $(DEPSDIR)/$*.d -o $(GFXBUILD)/$*.t3x
+
+#---------------------------------------------------------------------------------
+else
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+$(OUTPUT).3dsx	:	$(OUTPUT).elf $(_3DSXDEPS)
+
+$(OFILES_SOURCES) : $(HFILES)
+
+$(OUTPUT).elf	:	$(OFILES)
+
+#---------------------------------------------------------------------------------
+# you need a rule like this for each extension you use as binary data
+#---------------------------------------------------------------------------------
+%.bin.o	%_bin.h :	%.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+#---------------------------------------------------------------------------------
+.PRECIOUS	:	%.t3x %.shbin
+#---------------------------------------------------------------------------------
+%.t3x.o	%_t3x.h :	%.t3x
+#---------------------------------------------------------------------------------
+	$(SILENTMSG) $(notdir $<)
+	$(bin2o)
+
+#---------------------------------------------------------------------------------
+%.shbin.o %_shbin.h : %.shbin
+#---------------------------------------------------------------------------------
+	$(SILENTMSG) $(notdir $<)
+	$(bin2o)
+
+-include $(DEPSDIR)/*.d
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------
diff --git a/day02/day02 b/day02/day02
new file mode 100755
index 0000000..e9e67a1
Binary files /dev/null and b/day02/day02 differ
diff --git a/day02/include/BridgingHeader.h b/day02/include/BridgingHeader.h
new file mode 100644
index 0000000..daa2f93
--- /dev/null
+++ b/day02/include/BridgingHeader.h
@@ -0,0 +1,9 @@
+#include <3ds.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+static inline void gspWaitForVBlankWrapper(void) {
+    gspWaitForVBlank();
+}
+
diff --git a/day02/source/day02.swift b/day02/source/day02.swift
new file mode 100644
index 0000000..1fbf1b1
--- /dev/null
+++ b/day02/source/day02.swift
@@ -0,0 +1,85 @@
+#if !hasFeature(Embedded)
+import Foundation
+#endif
+
+@main
+struct Day02 {
+    #if hasFeature(Embedded)
+    static func main() {
+        gfxInitDefault()
+        consoleInit(GFX_TOP, nil)
+
+        run()
+
+        // Main loop
+        while aptMainLoop() {
+            hidScanInput()
+            let kDown = hidKeysDown()
+            if kDown & KEY_START != 0 {
+                break // break in order to return to hbmenu
+            }
+
+            gfxFlushBuffers()
+            gfxSwapBuffers()
+        }
+
+        gfxExit()
+    }
+
+    #else
+    static func main() {
+        run()
+    }
+    #endif
+
+    static func run() {
+        print("Parsing...")
+        let parsed = parseInput(realInput)
+        print("Running Part 1...")
+        part1(parsed)
+        //part2(parsed)
+        print("Finished!")
+    }
+
+    typealias ParsedInput = [(UInt64, UInt64)]
+
+    static func parseInput(_ input: String) -> ParsedInput {
+        input.split(separator: ",")
+            .filter({ line in
+                let split = line.split(separator: "-")
+                return String(split[0]).count % 2 == 0 || String(split[1]).count % 2 == 0
+            })
+            .map({ line in
+                let split = line.split(separator: "-")
+                return (UInt64(split.first!)!, UInt64(split.last!)!)
+            })
+    }
+
+    static func part1(_ input: ParsedInput) {
+        var sum: UInt64 = 0
+        for (lhs, rhs) in input {
+            for cur in lhs...rhs {
+                let cnt = String(cur).count
+                guard cnt % 2 == 0 else { continue }
+                let low = cur % UInt64(pow(10, (Double(cnt) / 2)))
+                let hi = low * UInt64(pow(10, (Double(cnt) / 2)))
+                if cur == hi + low {
+                    sum += cur
+                }
+            }
+        }
+        print("Part 1: \(sum)")
+    }
+
+    static func part2(_ input: ParsedInput) {
+
+    }
+}
+
+let testInput = """
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124
+"""
+
+let realInput = """
+492410748-492568208,246-390,49-90,16-33,142410-276301,54304-107961,12792-24543,3434259704-3434457648,848156-886303,152-223,1303-1870,8400386-8519049,89742532-89811632,535853-567216,6608885-6724046,1985013826-1985207678,585591-731454,1-13,12067202-12233567,6533-10235,6259999-6321337,908315-972306,831-1296,406-824,769293-785465,3862-5652,26439-45395,95-136,747698990-747770821,984992-1022864,34-47,360832-469125,277865-333851,2281-3344,2841977-2953689,29330524-29523460
+"""